Water Management Division

Missouri River Mainstem System

January 2012

2011-2012 Annual Operating Plan

2011-2012

AOPFinal

Annual Operating Plan Process59 Years Serving the Missouri River Basin

Fort Peck

Garrison

OaheBig Bend

Ft. Randall

Gavins Point

US Army Corpsof Engineers

Missouri River BasinNorthwestern Division

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MISSOURI RIVER MAINSTEM RESERVOIR SYSTEM

Annual Operating Plan 2011 - 2012

List of Tables ..................................................................................................................... ii List of Plates ...................................................................................................................... ii List of Abbreviations ...................................................................................................... iii Definition of Terms ......................................................................................................... iv I. FOREWORD ..........................................................................................................1 II. BACKGROUND AND AOP PROCESS .............................................................4 III. MAINSTEM MASTER MANUAL AND ESA CONSULTATIONS ....................5 IV. FUTURE RUNOFF: AUGUST 2011 – DECEMBER 2012 .................................7 V. ANNUAL OPERATING PLAN FOR 2011-2012 ..............................................9 A. General ........................................................................................................9 B. 2011-2012 AOP Simulations ..................................................................10

C. Regulation for the Balance of 2011 Nav. Season and Fall of 2011 ....13 D. Regulation Plan for Winter 2011-2012 .................................................15 E. Regulation During the 2012 Navigation Season .................................17 F. Regulation Activities for T&E Species and Fish Propagation ..........19 G. Regulation Activities for Historical and Cultural Properties ..........22 VI. SUMMARY OF RESULTS EXPECTED IN 2012 .............................................24 A. Flood Control ...........................................................................................25 B. Water Supply and Water Quality Control ..........................................26 C. Irrigation ...................................................................................................27 D. Navigation ................................................................................................28 E. Power ........................................................................................................28 F. Recreation, Fish and Wildlife ................................................................28 G. Historic and Cultural Properties...........................................................28 H. System Storage ........................................................................................31 I. Summary of Water Use by Functions ..................................................31 VII. TENTATIVE PROJECTION OF REGULATION THROUGH

FEBRUARY 2018 .................................................................................................33 A. Median Runoff .........................................................................................33 B. Lower Quartile Runoff ...........................................................................38 C. Lower Decile Runoff ...............................................................................38

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TABLES I Natural and Net Runoff at Sioux City ...............................................................8 II Navigation Service Support for the 2012 Season ............................................18 III Summary of 2011-2012 Draft AOP Studies .....................................................24 IV Peaking Capability and Sales ............................................................................30 V Energy Generation and Sales ............................................................................30 VI Anticipated December 31, 2012 System Storage .............................................31 VII Missouri River Mainstem System Water Use for Calendar Years 2010,

2011, and 2012 Above Sioux City, Iowa ...........................................................32 VIII Navigation Service Support, Spring Pulses, Unbalancing – AOP Extension Studies ................................................................................................34 IX Median Extension Studies – Criteria Considered in the Modeling Process ..................................................................................................................35 X Lower Quartile Extension Studies – Criteria Considered in the Modeling Process ..................................................................................................................36 XI Lower Decile Extension Studies – Criteria Considered in the Modeling Process ..................................................................................................................37

PLATES 1 Missouri River Basin Map 2 Summary of Engineering Data 3 Summary of Master Manual Technical Criteria 4 System Storage and Fort Peck Elevations 2011-2012 AOP Simulation 5 Garrison and Oahe Elevations 2011-2012 AOP Simulation 6 System Storage 1953-2012 7 Gavins Point Releases 1953-2012 8 Fort Peck Elevations and Releases 1953-2012 9 Garrison Elevations and Releases 1953-2012 10 Oahe Elevations and Releases 1953-2012 11 Fort Randall Elevations and Releases 1953-2012 12 Reservoir Release and Unregulated Flow 13 System Gross Capability and Average Monthly Generation 14 Tentative Five Year Extensions of 2011-2012 AOP – System Storage,

Gavins Point Regulated Flows, and System Peaking Capability 15 Tentative Five Year Extensions of 2011-2012 AOP – Fort Peck, Garrison,

Oahe and Fort Randall 16 American Indian Reservations

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ABBREVIATIONS

AOP - annual operating plan ACHP - Advisory Council on Historic Preservation AF - acre-feet B - Billion BiOp - Biological Opinion BOR - Bureau of Reclamation cfs - cubic feet per second Corps - Corps of Engineers CY - calendar year (January 1 to December 31) elev - elevation ESA - Endangered Species Act ft - feet FTT - Flow-to-Target FY - fiscal year (October 1 to September 30) GWh - gigawatt hour ISAP - Independent Science Advisory Panel KAF - 1,000 acre-feet kcfs - 1,000 cubic feet per second kW - kilowatt kWh - kilowatt hour MAF - million acre-feet MRNRC - Missouri River Natural Resources Committee msl - mean sea level MW - megawatt MWh - megawatt hour NEPA - National Environmental Policy Act plover - piping plover PA - Programmatic Agreement P-S MBP - Pick-Sloan Missouri Basin Program RCC - Reservoir Control Center RM - river mile RPA - Reasonable and Prudent Alternative SHPO - State Historic Preservation Officers SR - Steady Release System - Missouri River Mainstem System tern - interior least tern T&E - Threatened and Endangered THPO - Tribal Historic Preservation Officers USFWS - United States Fish and Wildlife Service WY - water year yr - year

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DEFINITION OF TERMS Acre-foot (AF, ac-ft) is the quantity of water required to cover 1 acre to a depth of 1 foot and is equivalent to 43,560 cubic feet or 325,850 gallons. Cubic foot per second (cfs) is the rate of discharge representing a volume of 1 cubic foot passing a given point during 1 second and is equivalent to approximately 7.48 gallons per second or 448.8 gallons per minute. The volume of water represented by a flow of 1 cubic foot per second for 24 hours is equivalent to 86,400 cubic feet, approximately 1.983 acre-feet, or 646,272 gallons. Discharge is the volume of water (or more broadly, volume of fluid plus suspended sediment) that passes a given point within a given period of time. Drainage area of a stream at a specific location is that area, measured in a horizontal plane, enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into the river above the specified point. Figures of drainage area given herein include all closed basins, or noncontributing areas, within the area unless otherwise noted. Drainage basin is a part of the surface of the earth that is occupied by drainage system, which consists of a surface stream or body of impounded surface water together with all tributary surface streams and bodies of impounded water. Gaging station is a particular site on a stream, canal, lake, or reservoir where systematic observations of hydrologic data are obtained. Runoff in inches shows the depth to which the drainage area would be covered if all the runoff for a given time period were uniformly distributed on it. Streamflow is the discharge that occurs in a natural channel. Although the term "discharge" can be applied to the flow of a canal, the word "streamflow" uniquely describes the discharge in a surface stream course. The term "streamflow" is more general than "runoff" as streamflow may be applied to discharge whether or not it is affected by diversion or regulation.

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MISSOURI RIVER MAINSTEM RESERVOIR SYSTEM

Annual Operating Plan 2011 – 2012

I. FOREWORD The historic flood of 2011 was unprecedented in both magnitude and duration and has severely impacted many communities, homeowners, farmers and businesses in the Missouri River basin. The U.S. Army Corps of Engineers (Corps) is committed to working with stakeholders throughout the region to best prepare the basin for the 2012 runoff season. Basin citizens and their elected officials have legitimately called for the preeminence of flood control. The system is vulnerable and many repairs will not be completed prior to the start of the 2012 runoff season. As a result, the Corps will maintain a flexible posture through the fall and winter as the remaining flood water is evacuated from the system. In particular, if conditions throughout the winter indicate that 2012 will be another high runoff year, the Corps will begin early evacuation of water from the system to provide additional storage to the extent that weather and downstream conditions allow. In addition, the Corps will communicate more broadly and frequently as the 2012 runoff season unfolds. Beginning in January the Corps will hold twice monthly conference calls with Federal, state, county and local officials, Tribes, emergency management officials, independent experts and the media to discuss conditions on the ground and the current release plans and forecasts. Recordings of the conference calls will be made available to the public through the Corps’ website. As part of post-flood assessment efforts, the U.S. Army Corps of Engineers, Northwestern Division, enlisted the assistance of experts in meteorology, hydrology, streamflow forecasting and reservoir system operations to review, analyze and assess the Corps’ operation of the six mainstem dams along the Missouri River leading up to, and during the flood of 2011. The panel began its independent review on 4 October 2011 and submitted its findings to the Corps on 19 December 2011. The report is available on the Corps’ website. The panel reviewed and assessed a number of questions, including whether water management decisions made during the flood of 2011 were appropriate and in alignment with the Missouri River Mainstem Reservoir System Master Water Control Manual (Master Manual), the water control plan that guides the operation of the Missouri River. The team also looked at whether the Corps could have prevented or reduced the impact of flooding by taking other management actions leading up to the flood, whether long-term regulation forecasts properly accounted for the runoff into the mainstem system, whether climate change played a role in this year’s record runoff and

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the role floodplain development played in the operation of the reservoir system proper to and during this year’s flood event. The panel’s report also included recommendations for improvement, many of which can be implemented immediately; others may require detailed analysis and implementation could require a formal stakeholder process. In particular, the Corps has already begun to implement several of the recommendations including plans to update hydrologic studies and to review the flood control storage allocation. The Corps will also collaborate with other Federal, state and local agencies and our field offices to improve runoff forecasts, particularly as it relates to plains snowpack. This will require a collaborative effort to improve both data collection (i.e. plains snowpack water equivalent, soil moisture and frost depth) and hydrologic modeling. The Missouri River Flood Task Force may serve an excellent venue to accomplish this effort. The Corps will also improve our outreach efforts through earlier and more frequent communication including the twice monthly conference calls which are scheduled to begin in January 2012. This Annual Operating Plan (AOP) presents pertinent information and plans for regulating the Missouri River Mainstem Reservoir System (System) through December 2012 under widely varying water supply conditions. It is important to note that the AOP is not intended to be a forecast for the coming year; rather it examines a range of potential runoff scenarios which span 80 percent of the historic record. There is still a 10 percent chance that runoff will be higher than shown in the AOP and a 10 percent chance that it will be lower. The studies included in the AOP provide an array of reservoir levels and releases that may be expected under the various runoff scenarios. It also indicates how the reservoir system will be regulated to serve the Congressionally authorized project purposes; to fulfill the Corps’ responsibilities to Native American Tribes; and to comply with environmental laws, including the Endangered Species Act (ESA). The AOP provides a framework for the development of detailed monthly, weekly, and daily regulation schedules for the System's six individual dams during the coming year. Actual real-time regulation of the system is done using the best information and tools available and is adjusted to respond to changing conditions on the ground. As the runoff season unfolds, there is a possibility that real-time regulation plans will indicate runoff volumes, reservoir levels and releases outside those anticipated in this report. Should that occur, the Corps will appreciably increase its communication and outreach efforts to convey that information to stakeholders throughout the basin so that other Federal, state and local agencies, Tribes, communities, and local residents can take appropriate actions. Regulation of the system is directed by the Missouri River Basin Water Management Division, Northwestern Division, U. S. Army Corps of Engineers (Corps) located in Omaha, Nebraska. A map of the Missouri River basin is shown on Plate 1

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and the summary of engineering data for the six individual mainstem projects and System is shown on Plate 2. This plan may require adjustments such as when substantial departures from expected runoff occur; to meet emergencies including short-term intrasystem adjustments to protect human health and safety, during periods of extended drought to maintain minimum river or reservoir levels to keep intakes operational, and adjustments in reservoir releases or reservoir levels to prevent loss of historic and cultural properties; or to meet the provisions of applicable laws, including the ESA. These adjustments would be made to the extent possible after evaluating impacts to all System uses, would generally be short term in nature and would continue only until the issue is resolved. This document provides the plan for future regulation of the System. Other documents that may be of interest include the “System Description and Regulation” report dated November 2007 or the “Summary of Actual Calendar Year 2010 Regulation,” dated September 2011. Both reports are currently available at the “Reports and Publications” link on our web site at: www.nwd-mr.usace.army.mil/rcc, or you may contact the Missouri River Basin Water Management Division at 1616 Capitol Avenue, Suite 365, Omaha, Nebraska 68102-4909, phone (402) 996-3841 for copies. The “Summary of Actual Calendar Year 2011 Regulation” will be available at the same site in late spring or early summer of 2012.

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II. BACKGROUND AND AOP PROCESS Beginning in 1953, projected System reservoir regulation for the year ahead was developed annually as a basis for advance coordination with the various interested Federal, State, and local agencies and private citizens. Also beginning in 1953, a coordinating committee was organized to make recommendations on each upcoming year's System regulation. The Coordinating Committee on Missouri River Mainstem Reservoir Operations held meetings semiannually until 1981 and provided recommendations to the Corps. In 1982, the Committee was dissolved because it did not conform to the provisions of the Federal Advisory Committee Act. Since 1982, to continue providing a forum for public participation, one or more open public meetings are held semiannually in the spring and fall. The fall public meetings are conducted to take public input on the Draft AOP, which typically is published in mid-September each year. The spring meetings are conducted to update the public on the current hydrologic conditions and projected System regulation for the remainder of the year as it relates to implementing the Final AOP. Under the terms of Stipulation 18 of the March 2004 “Programmatic Agreement for the Operation and Management of the Missouri River Main Stem System for Compliance with the National Historic Preservation Act, as amended” (PA) the Corps has agreed to consult/meet with the affected Tribes and Tribal Historic Preservation Officers (THPO’s), State Historic Preservation Officers (SHPO’s), the Advisory Council on Historic Preservation (ACHP) and other parties on the Draft AOP. The purpose of this consultation/meeting is to determine whether operational changes are likely to cause changes to the nature, location or severity of adverse effects to historic properties or to the types of historic properties affected and whether amendments to the Corps Cultural Resources Management Plans and Five-Year Plan are warranted in order to better address such effects to historic properties. During 2006 the Corps worked with the affected Tribes to establish processes for consultation on AOP’s under 36 CFR Part 800, the PA, and Executive Order 13175. The process consists of a series of informational meetings with the Tribes and/or government-to-government consultation with Tribes, as requested. A letter, dated September 22, 2011, was sent to the Tribes offering consultation on the 2011-2012 AOP. Meeting times and locations of the eight fall public meetings were also provided. Separate meetings will be scheduled for all Tribes requesting government-to-government consultation. All tribes, whether signatory to the PA or not, may request government-to-government consultation on this and all future AOP’s. In addition, the Tribes have reserved water rights to the Missouri River and its major tributaries. In no way does this AOP attempt to define, regulate or quantify water rights or any other rights that the Tribes are entitled to by law or treaty. The 2011 spring public meetings were held at the following locations and dates: April 12 at Nebraska City, Nebraska, and Fort Peck, Montana; April 13 at Bismarck, North Dakota and Pierre, South Dakota; April 14 at Jefferson City, Missouri and Kansas

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City, Missouri. The attendees were given an update regarding the outlook for 2011 runoff and projected System regulation for the remainder of 2011. Eight fall public meetings, which included both an afternoon open house and a traditional evening public meeting, were held on the Draft 2011-2012 AOP at the following locations: October 24 in Omaha, Nebraska; October 25 in St. Joseph, Missouri; October 26 in Overland Park, Kansas; October 27 in Jefferson City, Missouri; October 31 in Glasgow, Montana; November 1 in Bismarck, North Dakota; November 2 in Pierre, South Dakota; and November 3 in Sioux City, Iowa. In the spring of 2012, public meetings will be held to discuss the basin’s hydrologic conditions and the effects those conditions are expected to have on the implementation of the Final 2011-2012 AOP.

III. MAINSTEM MASTER MANUAL AND ESA CONSULTATIONS

The System is comprised of six dam and reservoir projects authorized by the Rivers and Harbors Act of 1935 and the Flood Control Act of 1944. Section 9 of the 1944 Flood Control Act authorized the System to be operated for the purposes of flood control, navigation, irrigation, hydropower, water supply, water quality control, recreation and fish and wildlife. In addition, operation of the System must also comply with other applicable Federal statutory and regulatory requirements, including the ESA. The System is regulated using guidelines published in the Master Manual. The Master Manual presents the water control plan and operational objectives for the integrated regulation of the System. Annual water management plans (Annual Operating Plans) are prepared each year, based on the water control criteria contained in the Master Manual, in order to detail reservoir regulation of the System for the current operating year. First published in 1960 and subsequently revised during the 1970s, the Master Manual was revised in March 2004 to include more stringent drought conservation measures. The 2003 Amendment to the 2000 Biological Opinion (2003 Amended BiOp) presented the USFWS’ opinion that the regulation of the System would jeopardize the continued existence of the endangered pallid sturgeon. The USFWS provided a Reasonable and Prudent Alternative (RPA) to avoid jeopardy to the pallid sturgeon that included a provision for the Corps to develop a plan to implement a bimodal ‘spring pulse’ from Gavins Point Dam. Working with the USFWS, Tribes, states and basin stakeholders, the Corps developed technical criteria for the bimodal spring pulse releases. In March 2006 the Master Manual was revised to include technical criteria for a spring pulse. Neither the 2004 nor the 2006 revisions to the Master Manual changed the volume of storage in the system reserved for flood risk reduction or the manner in which it is regulated. The Corps does not store water in the reservoirs specifically for the endangered species and the Master Manual storage allocations were not altered to facilitate the spring pulses. In years when water is released for endangered species, reservoir storage levels are not adjusted.

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Current regulation of the System in accordance with the Master Manual to serve

authorized project purposes is dependent on successful implementation of the 2003 Amended BiOp. Implementation of the RPA elements is accomplished through the Missouri River Recovery Program (MRRP) which includes the following elements: habitat construction including emergent sandbar habitat and shallow water habitat, flow modifications, propagation/hatchery support, research, monitoring and evaluation, and adaptive management. Simply put, the Corps must comply with environmental laws including the ESA, and the MRRP is the vehicle used to accomplish this. This AOP identifies flow modifications at Garrison, Fort Randall and Gavins Point for the benefit of the interior least tern and the piping plover while maintaining flood control and navigation as primary authorized purposes.

The 2011 flood event was unprecedented in both magnitude and duration along much of Missouri River resulting in significant damage to the projects, levees and other infrastructure. The Corps is in the initial phases of inspection, repair and restoration of this important infrastructure and it is unlikely that all repairs will be completed prior to the 2012 runoff season.

In addition, although a full assessment cannot be completed until the water levels recede, it is likely that the flood has also had a significant impact on the Missouri River ecosystem including emergent sandbar habitat utilized by the terns and plovers, and riverine habitat utilized by the pallid sturgeon. We expect emergent sandbar habitat to be abundant next year, as it was following the 1997 flood event; however riverine habitat impacts are generally unknown at this time. The river experienced a natural rise of near historic proportions in 2011, therefore we believe the efforts of the Missouri River Recovery Program should be focused on capturing the impact of the historic flood event rather than monitoring and analyzing a much smaller managed spring pulse in 2012.

Based on discussions with the USFWS regarding the above factors, and the ongoing review of the Gavins Point spring pulse by the Independent Science Advisory Panel (ISAP) which may inform the future direction of the spring pulse, this AOP does not include spring pulses from Gavins Point dam.

With regard to summer releases to minimize take of the interior least tern and piping plover, based on the historic runoff experienced this year, we anticipate an abundance of high, secure nesting habitat for the two bird species. This expectation is based on the observed habitat following the previous runoff of record in 1997. The proposed summer release pattern to be included in the AOP will be a steady release or a steady release flow-to-target pattern provided nests are at a sufficient elevation so as not to be inundated.

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The Corps will continue to work closely with the USFWS to ensure the AOP will meet the intent of the 2003 Amended BiOp and result in management actions that support the continued existence of these species on the river.

Additional information on other efforts undertaken through the Missouri River Recovery Program to meet the requirements of the 2003 Amended BiOp can be found in the Annual Report on the Biological Opinion which can be found on the “MRRP Documents” page of the Recovery Program website at: www.moriverrecovery.org.

IV. FUTURE RUNOFF: AUGUST 2011 - DECEMBER 2012 Runoff into the six System reservoirs is typically low and relatively stable during the August-to-February period. The August 1 calendar year runoff forecast is normally used as input to the Basic reservoir regulation simulation in the AOP studies for the period August 2011 to February 2012. Due to the on-going flood evacuation and much higher than normal August runoff, this year’s AOP studies use the September 1 calendar year runoff forecast as input to the Basic simulation. The September 1 runoff forecast for 2011 was 61.0 million acre-feet (MAF). Two other runoff scenarios based on the September 1 runoff forecast were developed for the same period. These are the Upper Basic and Lower Basic simulations, which are based on 120 percent and 80 percent of the September through February runoff forecast, respectively. Simulations for the March 1, 2012 to February 28, 2013 time period use five statistically derived inflow scenarios based on an analysis of historic water supply. The report detailing the development of these inflow scenarios was updated in July 2008 to include 9 additional years of inflow data that now extends from 1898 to 2006. This report will be updated during 2012 to include runoff data from 2007 through 2011. The updated analysis will incorporate the current series of wet years including 2010, which was the fourth wettest year on record, and 2011, which was the wettest year on record. Using statistically derived inflow scenarios for the AOP provides a good range of simulation for dry, average, and wet conditions, and eliminates the need to forecast future precipitation months in advance, which is very difficult. In contrast, real-time regulation of the System is based on all available and relevant hydrometerological information including, but not limited to observed runoff volumes, National Weather Service short and long-range outlooks, plains and mountain snowpack data, observed base flows, soil moisture and frost depths. The five statistically derived inflows used in the AOP are identified as the Upper Decile, Upper Quartile, Median, Lower Quartile and Lower Decile runoff conditions. Upper Decile runoff (34.3 MAF) has a 1 in 10 chance of being exceeded, Upper Quartile (30.3 MAF) has a 1 in 4 chance of being exceeded, and Median (24.4 MAF) has a 1 in 2 chance of being exceeded. Lower Quartile runoff (19.3 MAF) has a 1 in 4 chance of the

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occurrence of less runoff, and Lower Decile (16.2 MAF) has a 1 in 10 chance of the occurrence of less runoff. There is still a 20 percent chance that a runoff condition may occur that has not been simulated; i.e., a 10 percent chance runoff could be lower than Lower Decile and a 10 percent chance runoff could be greater than Upper Decile. The Upper Decile and Upper Quartile simulations extend from the end of the Upper Basic simulation through February 2013. Likewise, the Median simulation extends from the end of the Basic simulation, and the Lower Quartile and Lower Decile simulations extend from the end of the Lower Basic simulation through February 2013. The estimated natural flow at Sioux City, the corresponding post-1949 water use effects, and the net flow available above Sioux City are shown in Table I, where water supply conditions are quantified for the period September 2011 through February 2013. The natural water supply for calendar year (CY) 2010 totaled 38.7 MAF.

TABLE I

NATURAL AND NET RUNOFF AT SIOUX CITY (Volumes in 1,000 Acre-Feet)

Natural 1/ Post-1949 Depletions Net 2/ September 2011 through February 2012 (Basic Runoff Scenario) Basic 7,300 1,400 8,700 Upper Basic (120%) 8,800 1,400 10,200 Lower Basic (80%) 5,800 1,400 7,200 Runoff Year March 2012 through February 2013 (Statistical Analysis of Past Records) Upper Decile 34,300 -2,500 31,800 Upper Quartile 30,300 -2,500 27,800 Median 24,400 -2,600 21,800 Lower Quartile 19,300 -2,500 16,800 Lower Decile 16,200 -2,400 13,800 1/ The word “Natural” is used to designate runoff adjusted to the 1949 level of basin development, except that regulation and evaporation effects of the Fort Peck reservoir have also been eliminated during its period of regulation prior to 1949. 2/ The word “Net” represents the total runoff after deduction of the post-1949 irrigation, upstream storage, and other use effects.

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V. ANNUAL OPERATING PLAN FOR 2011-2012 A. General. The Missouri River basin experienced a historic flood in 2011 with record runoff into the reservoir system, currently forecast to total 60.8 million acre-feet (MAF). Record pool elevations were set at three projects: Fort Peck, Oahe and Fort Randall; surcharge storage was utilized at Fort Peck and Garrison; spillways at Garrison and Big Bend that had never been used before were opened, and releases from all projects reached rates more than twice the previous records with catastrophic results from Montana to Missouri. The flood caused widespread damages from Montana to Missouri and caused many to question the validity of the Master Manual with regard to flood control. A risk analysis was conducted to determine the best way to prepare the basin for the 2012 runoff season. A number of options were considered, including several that provided more than 16.3 MAF of flood control storage as called for in the Master Manual. The selected drawdown strategy was designed to evacuate stored flood water as quickly as possible to allow people to get back into their homes, farms and businesses to begin the process of recovery, and to allow inspection and repair of infrastructure including the dams and levees to ensure they are ready for the 2012 season. Due to the risk imposed by the sustained high releases necessary to provide additional flood control storage, and the associated delay in the recovery process, the selected plan does not draw down system storage below the base of the Annual Flood Control and Multiple Use zone. However, a more flexible posture will be taken as water is evacuated during the fall and early winter, and if it appears that 2012 will be another high runoff year the corps will aggressively release water during the winter and spring as weather permits and repair work allows. This year’s decision does not preclude changes in flood control storage in the future. The Corps will conduct an extensive review to assess the operation of the reservoir system, its effects, and where improvements or adjustments may be warranted. Given the 2011 record runoff, and the fact that this record runoff exceeded the design capacity of the system by over 20 percent, the Corps will conduct an analysis to determine how additional flood control storage may improve flood risk reduction for storms greater than the current design storm, including runoff volumes equal to and greater than the 2011 event. The study is intended to inform the path forward and will include a limited investigation of the potential impacts on other authorized purposes if such a change was made. Given the complexity of the issue and impacts on other authorized purposes, further studies might be recommended. This and other information, such as results of the external peer review of the 2011 system operation and a lower basin coincident frequency analysis, will be used to determine whether a Master Manual revision and/or reallocation study should be considered. The anticipated regulation described in this AOP is designed to meet the regulation objectives presented in the current Master Manual. While some aspects of System and individual project regulation are clearly defined by technical criteria in the Master Manual, for example navigation service level and season length, others such as

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minimum releases for irrigation and water supply in the reaches between the reservoirs are based on regulation experience and will be adjusted as needed to respond to changing conditions. Consideration has been given to all of the authorized project purposes, to historic and cultural resources and to the needs of threatened and endangered (T&E) species. The “System Description and Regulation” report provides a concise summary of the primary aspects of System regulation and should be referred to for further information. For ease of use, a summary of the frequently used technical criteria included in the Master Manual is presented on Plate 3. The plan relies on a wealth of regulation experience. Reservoir regulation experience available for preparation of the 2011-2012 AOP includes 13 years of regulation at Fort Peck (1940) as the sole Mainstem project, plus 58 years of System experience as Fort Randall (1953), Garrison (1955), Gavins Point (1955), Oahe (1962), and Big Bend (1964) were brought progressively into System regulation. This regulation experience includes lessons learned during two major droughts of six and eight years (1987-1992 and 2000–2007) that have occurred since the System filled in 1967. It also includes the high runoff period from 1993 – 1999 during which five of the seven years experienced runoff greater than Upper Quartile including the previous record runoff of 49.0 MAF in 1997, and the record runoff of 2011, forecast to be 60.8 MAF. In addition to the long period of actual System reservoir regulation experience, many background regulation studies for the completed System are available for reference. B. 2011-2012 AOP Simulations. AOP simulations for the five runoff scenarios are shown in the final section of this AOP as studies 4 through 8. As previously stated, the simulations use five statistically derived runoff scenarios and reflect 80 percent of the historic annual runoff volumes (between Upper and Lower Decile). The simulations provide information for planning purposes on a range of future reservoir levels and release rates, and are not meant to represent a particular forecast. The simulations shown use a monthly time-step, and thus do not provide the level of detail necessary to address specific flood control regulations. Detailed routing of specific flood flows is accomplished using forecast models which incorporate real time information including observed and forecasted precipitation, and these situations are handled individually during real-time regulation. The AOP studies, in summary, provide the following: the full flood control capacity of the reservoir system will be available at the start of the runoff season and use of the exclusive flood control zone is not anticipated under any of the five runoff scenarios covered in the AOP; full service flow support throughout a full length navigation season under all runoff scenarios; lower than normal winter releases for Lower Quartile and Lower Decile runoff, normal winter releases under Median runoff, and above normal winter releases for Upper Decile and Upper Quartile runoff; a steady release-flow to target regulation during the tern and plover nesting season for Median and

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below runoff and nearly steady releases for Upper Quartile and Upper Decile runoff though flood water evacuation is required; emphasis on Fort Peck and Oahe for a steady to rising reservoir level during the forage fish spawn; and reservoir releases and pool levels sufficient to keep all intakes operational under all runoff scenarios. While likely not the case for the 2011-2012 runoff year, water conservation measures will be implemented if runoff conditions indicate that it would be appropriate including cycling releases from Gavins Point during the early part of the nesting season, only supporting flow targets in reaches being used by commercial navigation, and utilization of the Kansas River projects authorized for Missouri River navigation flow support. Additional details about the studies are provided in the following paragraphs. Results of the simulations are shown in Plate 4 and Plate 5 for the System storage and the Fort Peck, Garrison and Oahe pool elevations. Under all runoff scenarios modeled for the AOP, the full flood control capacity of the system is available at the start of the 2012 runoff season and all 2012 runoff is evacuated prior to the start of the 2013 runoff season. Although the March 1 and May 1 System storage is above the Gavins Point spring pulse precludes of 40.0 MAF, as discussed in Chapter III, spring pulses will not be conducted in 2012. The Corps will continue to work closely with the USFWS to ensure the AOP will meet the intent of the 2003 Amended BiOp and comply with the ESA. The March 15 and July 1 System storage checks were used to determine the level of flow support for navigation and other downstream purposes as well as the navigation season length in 2012. Full service navigation flows or more are provided for all runoff conditions throughout the navigation season. Application of the July 1 System storage check (see Plate 3) indicate that a full length navigation season would be provided for Median and lower runoff conditions. The upper two runoff scenarios provide a 10-day extension to the navigation season. Upper Quartile and Upper Decile simulations reach the desired 56.8 MAF System storage level on March 1, 2013. Storage is below the base of the annual flood control zone for median and lower runoff conditions. For modeling purposes in this AOP, the Steady Release – Flow to Target (SR-FTT) regulation scenario for Gavins Point dam is shown during the 2012 tern and plover nesting season for Median and lower runoff conditions. For these simulations, the monthly average May release used in the simulations was determined by using the long-term average release (see Plate 3) based on the service level for the first third of the month, followed by cycling between the May and July table values for the remainder of the month to reflect an every third day peaking cycle from Gavins Point. The modeled June release was set equal to the long-term average release for July (see Plate 3) based on the service level for the first half of the navigation season. The long-term average releases (see Plate 3) were used for July and August to indicate flowing to target. The Upper Quartile and Upper Decile runoff simulations follow the Master Manual, with much above normal runoff requiring release increases early in the year to

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evacuate floodwater from the reservoirs. Although these modeled Gavins Point releases represent our best estimate of required releases during 2012, actual releases will be based on hydrologic conditions and the availability of habitat at that time. To the extent reasonably possible, measures to minimize incidental take of the protected species will be utilized. These may include not meeting flow targets in reaches without commercial navigation and utilizing the Kansas River tributary reservoirs for navigation flow support when appropriate. It may also be necessary to cycle releases for flood control regulation during the T&E species’ nesting season. The long-term average Gavins Point releases to meet target flows were used in the AOP studies for navigation support during the spring and fall months with the exception of Upper Quartile and Upper Decile. Under those two runoff scenarios, releases were based on flood water evacuation. Based on the September 1 storage checks and flood evacuation criteria, modeled Gavins Point winter releases ranged from 20,000 cfs to 24,000 cfs during the 2011-2012 winter season depending on the runoff scenario, and from 12,000 cfs to 20,000 cfs during the 2012-2013 winter season depending on the runoff scenario. Releases above theses ranges will be made in real-time operations during the winter of 2011-2012 to aggressively evacuate water from the system if conditions indicat that 2012 will be another high runoff year. Gavins Point releases will be increased to meet downstream water supply requirements in critical reaches, to the extent reasonably possible, if downstream incremental runoff is low. The Gavins Point releases shown in this and previous AOPs are estimates based on historic averages and experience. Adjustments are made as necessary in real-time based on hydrologic conditions. Intrasystem releases are adjusted to best serve the multiple purposes of the projects with special emphasis placed on regulation for non-listed fisheries starting in early April and for T&E bird species beginning in early May and continuing through August. As part of the overall plan to rotate emphasis among the upper three reservoirs during low runoff years, Fort Peck and Oahe are scheduled to be favored during the 2012 forage fish spawn while also attempting to maintain rising water levels at Garrison. The Median, Upper Quartile, and Upper Decile simulations show that it is possible to provide steady-to-rising pool levels in each of the three large upper reservoirs during the spring forage fish spawn period. Releases in the Lower Quartile and Lower Decile simulations are adjusted to maintain steady-to-rising pool levels at Fort Peck and Oahe. The Lower Quartile and Lower Decile simulations show the Garrison pool dropping during April and May. Two additional modified reservoir regulation plans, the Fort Peck “mini-test” and unbalancing the upper three reservoirs, have been discussed in previous AOPs, but have not been implemented in recent years. Due to the large variability of reservoir levels in recent years, the unbalancing of the three reservoirs to benefit reservoir

13

fisheries and the endangered interior least tern and threatened piping plover will not be implemented 2012. Additionally, experience has shown that storing water in the annual flood control zone, particularly at Oahe, as the current criteria requires in order to implement unbalancing is undesirable due to flood control impacts. The Corps will work with each of the appropriate state agencies in 2012 to determine a modified version of unbalancing that may be implemented in future AOP’s that does not adversely impact flood control. For the purposes of this AOP, the upper three reservoirs are shown in a balanced condition for all runoff scenarios. This balancing is computed based on the percent of the carryover multiple-use pool. With regard to the Fort Peck mini-test, a priority for pallid sturgeon recovery has been placed on the Lower Yellowstone Project at Intake, Montana. The Fort Peck mini-test and full test flows will be deferred until the efficacy of the Lower Yellowstone Project has been assessed. The groundbreaking for this project took place in August 2010. Actual System regulation from January 1 through August 31, 2011 and the simulated regulating plans for each project through CY 2012 using the five runoff scenarios described on Page 4 are presented on Plate 6 through Plate 11, inclusive. Big Bend regulation is omitted since storage at that project is relatively constant and average monthly releases are essentially the same as those at Oahe. These plates also show, on a condensed scale, actual regulation since 1953. Plate 12 illustrates for Fort Peck, Garrison, Oahe, and Gavins Point the actual releases (Regulated Flow) as well as the Missouri River flows that would have resulted if the reservoirs were not in place (Unregulated Flow) during the period January 2010 through July 2011. Regulation of the reservoir system in 2011 reduced peak flows by approximately 40,000 to 60,000 cfs at Fort Peck and by approximately 80,000 to 100,000 cfs downstream of the Yellowstone River to the mouth near St. Louis. Plate 13 presents past and simulated gross average monthly power generation and gross peaking capability for the System. C. Regulation Plan for the Balance of the 2011 Navigation Season and Fall of 2011. The regulation of the System for the period of August though November 2011 is presented in the following paragraphs. Fort Peck Dam. As part of the continued evacuation of record runoff into the system in 2011, releases from Fort Peck were 30,000 cfs at the start of August, and then dropped to 25,000 cfs in mid-August. Releases were held at 25,000 cfs through late September when they were lowered to 20,000 cfs and eventually reached 9,000 cfs at the beginning of October. Average releases for August and September were 26,600 cfs and 23,000 cfs, respectively. Releases were held steady at 9,000 cfs from early October through early November and then increased to 10,000 cfs. The Fort Peck pool continued to drop quickly in September before slowing down in October and ending November near

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2237.1 feet msl. A record high Fort Peck pool elevation of 2252.3 feet msl was set on June 15, 2.3 feet above the top of exclusive flood control pool. The previous record high pool elevation was 2251.6 feet msl set in July 1975. Garrison Dam. Releases started August at 110,000 cfs and were gradually reduced to 65,000 cfs during the month. Releases continued to drop throughout September and ended the month at 26,000 cfs. Average releases for August and September were 91,100 cfs and 43,400 cfs, respectively. Releases were held steady at 26,000 cfs from October through early November, and then increased to 28,500 cfs to continue the evacuation of water from the annual flood control and multiple use zone. Releases were reduced in early December in anticipation of the December freeze-in downstream of Garrison between Washburn and Bismarck, North Dakota. The Garrison pool continued dropping quickly in September before slowing down in late September and then steadily dropping through the fall, ending at 1839.8 feet msl at the end of November. The Garrison pool elevation peaked at 1854.6 feet msl on July 1, 0.6 feet above the top of exclusive flood control pool. This was the second highest recorded pool elevation on record. The record high pool elevation was 1854.8 feet msl set in July 1975. Oahe Dam. Releases started the month of August at 135,000 cfs and were gradually reduced to 80,000 cfs during the month. Releases continued to drop throughout September reaching 40,000 cfs near the end of the month. The monthly average release was 117,100 cfs in August and 67,300 cfs in September. October and November releases averaged 27,800 cfs and 36,300 cfs, respectively, to continue the evacuation of the record runoff stored in Oahe and to accommodate the fall drawdown of the Fort Randall pool. The Oahe pool ended November at elevation 1607.4 feet msl. A record high Oahe pool elevation of 1619.7 feet msl was set on June 26, within 0.3 foot of the top of exclusive flood control pool. The previous record high pool elevation was 1618.7 feet msl set in June 1995 and 1996. Big Bend Dam. Releases parallel those from Oahe. Big Bend generally fluctuates between 1420.0 feet msl and 1421.0 feet msl for weekly cycling during high power load periods. Fort Randall Dam. Releases started the month of August at 147,000 cfs and gradually dropped to 86,000 cfs by the end of the month; averaging 133,000 cfs. Average releases were 80,000 cfs in September, 39,300 cfs in October, and 36,300 cfs in November to continue the evacuation of flood water, to facilitate the annual drawdown of Fort Randall and to back up the releases from Gavins Point Dam. Fort Randall reservoir peaked at a record elevation of 1374.0 ft msl on July 11 (previous record pool of 1372.2 occurred in May 1997). Releases during the late summer and fall were focused on evacuating the record volume of water stored in the system and completing the annual fall drawdown of the reservoir for winter hydropower generation. Releases will

15

be reduced after the navigation season ends in early December to the level required to back up Gavins Point winter releases. Gavins Point Dam. Releases were reduced from 155,000 cfs to 150,000 cfs on August 1, held at that rate through mid-August, and then gradually reduced to 90,000 cfs by the end of the month. The 90,000 cfs release rate was held until mid-September. Releases were reduced 5,000 cfs every other day until reaching 60,000 cfs and then reduced 5,000 cfs each day down to 40,000 cfs in early October. Releases were held at 40,000 cfs one week longer than initially planned as part of the Corps flexible release posture. These releases were above the level required for full service navigation levels to evacuate water from the reservoir system. A full length navigation season, plus a 10-day extension, was provided in 2011 in accordance with the technical criteria for the July 1 System storage check presented in the Master Manual. In accordance with the Missouri River Master Manual, during years of greater than normal water supply, the navigation season is extended as both an additional evacuation measure and to provide an increased benefit to navigation while striving to reach the base of the annual flood control zone by March 1 the following season. The last day of flow support for the commercial navigation season ranged from December 1 at Sioux City to December 10 at the mouth near St. Louis. Releases were reduced by approximately 3,000 cfs per day in early December until they reached 22,000 cfs. Releases will be maintained at that rate until colder weather moves into the basin at which time releases will be reduced to the winter release rate of 20,000 cfs. The 40,000 cfs release rate was extended through December 7, and higher winter releases may be adopted as repair work permits and conditions allow in order to evacuate additional water from the system. The Gavins Point pool level was raised 1.5 feet to elevation 1207.5 feet msl in September. The pool level will remain near that elevation during the fall and winter months. D. Regulation Plan for Winter 2010-2011. The September 1 System storage check is used to determine the winter release rate from Gavins Point dam. A winter release of 12,000 cfs is scheduled if System storage is less than 55 MAF on September 1; 17,000 cfs is scheduled when System storage is above 58 MAF; and the release is prorated for System storages between 55 and 58 MAF. A modification to the winter release rate from Gavins Point dam may occur when the evacuation of System flood control storage cannot be accomplished by providing a full-service navigation season with a 10-day extension of the navigation season. With an excess annual water supply, the winter season Gavins Point release may be scheduled at a rate of up to 25,000 cfs to continue to evacuate the remaining excess water in System flood control storage. The planned winter System release for 2011-2012 is 20,000 cfs. It is anticipated that this year’s winter release will be adequate to complete evacuation of stored flood waters and serve all downstream water intakes. Winter releases will remain flexible to allow evacuation of additional water as weather permits and repair work allows. In addition, an aggressive winter release schedule will be implemented if conditions indicate that 2012 will be another high runoff year.

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Fort Peck Dam. Releases are expected to average 11,000 cfs in December and 12,000 cfs in January and February to serve winter power loads and to draw down the lake to the base of the annual flood control pool. The Fort Peck pool level is expected to decline about 3.1 feet from elevation 2237.1 feet msl at the end of November to near elevation 2234.0 feet msl by March 1. Garrison Dam. Releases are scheduled to be 19,000 cfs in December increasing to 24,000 cfs for January and 26,000 cfs for February to serve winter power loads and to drawdown the reservoir to slightly below the base of the annual flood control pool. The December release rate will likely be reduced prior to the time of freeze-in to prevent ice induced flooding at the time of freeze-in. These temporary reductions in the releases may be scheduled to prevent exceedence of a 13-foot stage at the Bismarck gage. Flood stage is 16 feet. The Garrison pool level is expected to decline about 3.2 feet from elevation 1839.8 feet msl at the end of November to near elevation 1836.6 feet msl by March 1, 0.9 foot below the base of the annual flood control storage zone. Oahe Dam. Releases for the winter season will provide backup for the Fort Randall and Gavins Point releases plus refill the recapture space available in the Fort Randall reservoir consistent with anticipated winter power loads. Monthly average releases may vary substantially with fluctuations in power loads occasioned by weather conditions but, in general, are expected to average about 23,600 cfs. Daily releases will vary widely to best meet power loads. Peak hourly releases, as well as daily energy generation, will be constrained to prevent urban flooding in the Pierre and Fort Pierre areas if severe ice problems develop downstream of Oahe Dam. This potential reduction is coordinated with the Western Area Power Administration. The Oahe pool level is expected to slowly decline from 1607.1 feet msl at the end of November to 1605.9 feet msl at the end of December. The pool will stay steady during January before starting to rise to elevation 1606.7 feet msl, slightly under the base of the annual flood control storage zone, by the beginning of March. Big Bend Dam. The Big Bend pool level will be maintained in the normal 1420.0 to 1421.0 feet msl range during the winter. Fort Randall Dam. Releases will average about 18,000 cfs during the winter season to support Gavins Point winter releases. The Fort Randall pool level is expected to rise from its fall drawdown elevation of 1337.5 feet msl in early December to near elevation 1350.0 feet msl, the seasonal base of flood control, by March 1. However, if the plains snowpack flood potential downstream of Oahe Dam is quite low, the Fort Randall pool level will be raised to near 1353.0 feet msl by March 1. It is likely that a pool level as high as 1355.0 feet msl could be reached by the end of the winter period on March 31 if runoff conditions permit. The Fort Randall pool level above the White River delta near Chamberlain, South Dakota will remain at a higher elevation than the pool level below

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the delta from early October through December, due to the damming effect of this delta area. Gavins Point Dam. Gavins Point winter releases are discussed in the first paragraph of this section. The Gavins Point pool level will be near elevation 1207.5 feet msl until late February when it will be lowered to elevation 1206.0 feet msl to create additional capacity to store spring runoff. System storage for all runoff conditions will be at the base of the annual flood control zone of 56.8 million acre-feet, and possibly lower by March 1, 2012, the beginning of next year’s runoff season. E. Regulation During the 2012 Navigation Season. All five runoff scenarios modeled for this year’s AOP follow the technical criteria presented in the current Master Manual for downstream flow support. Beginning in mid-March, Gavins Point releases will be gradually increased to provide navigation flow support at the mouth of the Missouri near St. Louis, MO by April 1, 2012, the normal navigation season opening date. The corresponding dates at upstream locations are Sioux City, March 23; Omaha, March 25; Nebraska City, March 26; and Kansas City, March 28. However, if during the 2012 navigation season there is no commercial navigation scheduled to use the upper reaches of the navigation channel, we will consider eliminating navigation flow support in those reaches to conserve water in the System, provide additional flood control, and/or minimize incidental take of the protected species during the nesting season. Navigation flow support for the 2012 season will be determined by actual System storage on March 15 and July 1. Runoff scenarios modeled indicate full service flow support at the start of the 2012 navigation season for all runoff scenarios. Following the July 1 System storage check, full service would continue to be provided for all runoff scenarios. The normal 8-month navigation season is provided for Median and lower runoff scenarios as shown in Table II. A 10-day extension to the navigation season is provided for the upper two runoff scenarios.

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TABLE II NAVIGATION SERVICE SUPPORT

FOR THE 2012 SEASON

Runoff System Storage Flow Level Above or Season Scenario March 15 July 1 Below Full Service Shortening (MAF) (MAF) (MAF) (cfs) (Days) Spring Summer/Fall U.D. 34.3 57.8 65.0 +3.3 +19 0* U.Q. 30.3 57.6 63.9 0 +12 0* Med 24.4 57.5 61.6 0 0 0 L.Q. 19.3 57.3 58.4 0 0 0 L.D. 16.2 57.2 57.3 0 0 0 *Includes 10-day extension for Upper Quartile and Upper Decile As previously stated, the modeled regulation for the 2012 nesting season below Gavins Point dam is Steady Release – Flow-to-Target (SR-FTT). With the expectation of large quantities of high elevation nesting habitat being available, it’s possible that the actual regulation will be Flow-to-Target. The nesting situation will be closely monitored and if nesting appears to be taking place at low elevations a SR-FTT release scenario may be implemented. If a SR-FTT release scenario is used, the initial steady release, which has ranged from 18,000 cfs to 27,000 cfs in the five years previous to 2011, will be based on hydrologic conditions and the availability of habitat at that time. Model runs included in this AOP have a Gavins Point release peaking cycle of 2 days down and 1 day up during the last two-thirds of May to keep birds from nesting at low elevations. Gavins Point releases will be adjusted to meet downstream targets as tributary flows recede, but ideally the initial steady release will be sufficient to meet downstream targets until the majority of the birds have nested. The purpose of this regulation is to continue to meet the project purposes while minimizing the loss of nesting T&E species and conserving water in the upper three reservoirs, if required. Gavins Point releases for the Upper Quartile and Upper Decile runoff simulations are much above normal to evacuate flood water from the reservoirs. Releases from Garrison and Fort Randall will follow repetitive daily patterns from early May, at the beginning of the T&E species’ nesting season, to the end of the nesting in late August. In addition to the intra-day pattern, Fort Randall releases may also be cycled with 2 days of low releases and 1 day of higher releases during the early part of the nesting season to maintain release flexibility in that reach while minimizing the potential for take. Gavins Point releases may be quite variable during the 2012 navigation season but are expected to range from 26,000 to 52,000 cfs under the five runoff scenarios modeled. Release reductions necessary to minimize downstream flooding are not reflected in the

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monthly averages shown in the simulations but will be implemented as conditions warrant. Reductions in System releases to integrate the use of downstream Missouri River flow support from the Kansas Reservoir System have not been included since they are based on downstream hydrologic conditions. However, this storage will be utilized to the extent possible as a water conservation measure or to minimize incidental take of protected species during the nesting season if conditions indicate it is prudent to do so. Simulated storages and releases for the System and individual reservoirs within the System are shown on Plate 6 through Plate 11. Sufficient storage space exists in the System to control flood inflows under all scenarios simulated for this AOP, however, as experienced in 2011, runoff above or below simulated levels can occur and result in releases beyond those modeled for the AOP. As previously stated, should that occur, the Corps will increase its efforts to convey that information throughout the basin so that state and local agencies, communities, and local residents can take appropriate actions. F. Regulation Activities for T&E Species and Fish Propagation Enhancement. The ability to provide steady to rising pool levels in the upper three reservoirs in low runoff years is very dependent on the volume, timing, and distribution of runoff. The reservoir regulation simulations presented in this AOP for the Upper Decile, Upper Quartile, and Median runoff scenarios show that steady to rising pool levels would occur during the spring fish spawn period for the upper three System reservoirs. As part of the overall plan to rotate emphasis among the upper three reservoirs during low runoff years, Fort Peck and Oahe are scheduled to be favored during the 2012 forage fish spawn if runoff is below median. The studies show that inflows are sufficient to maintain steady to rising pools at Fort Peck and Oahe from April through June for the Lower Quartile and Lower Decile runoff scenarios. This will be accomplished by setting releases at Fort Peck and Garrison at a level that would maintain a rising Fort Peck and Oahe pool, but no less than the minimum required for downstream water supply requirements including irrigation. These adjustments may be restricted when the terns and plovers begin nesting in May. Garrison pool levels may fall during both lower runoff scenarios. If the drought re-emerges, emphasis during the fish spawn will be rotated among the upper three reservoirs and may also be adjusted to be opportunistic in regard to runoff potential. The upper three reservoirs will be managed to benefit forage fish to the extent reasonably possible, while continuing to serve the other Congressionally authorized project purposes. As discussed in the previous section, the 2011-2012 AOP will not include provisions for unbalancing the Fort Peck, Garrison, and Oahe reservoirs to benefit the reservoir fishery and endangered species, but unbalancing will be considered within the carryover multiple use zone in future years. Fort Peck Dam. The repetitive daily pattern of releases from Fort Peck Dam has not been implemented since the 2004 tern and plover nesting season. This adaptive

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management decision was made based on data collected during previous nesting seasons. In recent years, birds in this reach have nested on available high elevation habitat, and thus were not expected to be impacted by the potential range of releases from Fort Peck during the summer. Releases during the 2012 nesting season will not be restricted by the repetitive daily pattern unless habitat conditions or nesting patterns warrant a change. If flood flows enter the Missouri River below the project during the nesting season, hourly releases will generally be lowered to no less than 3,000 cfs in order to keep traditional riverine fish rearing areas continuously inundated, while helping to lower river stages at downstream nesting sites. In rare instances releases below 3,000 cfs may be scheduled for flood damage reduction. April releases should be adequate for trout spawning below the project. Maintaining a rising Fort Peck pool level will be dependent upon the daily inflow pattern to the reservoir, but appears possible under all the runoff scenarios. The Fort Peck “mini-test” will not be run pending an evaluation of the results of the Yellowstone River Intake Diversion fish passage structure. Garrison Dam. As in previous years, releases from Garrison will follow a repetitive daily pattern during the T&E nesting season to limit peak stages below the project for nesting birds. Releases are scheduled to be 1,000 cfs lower in July and early August than the June releases to enhance conditions for the fledging of chicks. High elevation nesting habitat is expected to be abundant below Garrison Dam during the 2012 nesting season. During 2012, cold-water habitat in Garrison should be adequate for all runoff scenarios. A rising pool at Garrison during the fish spawn in April and May will be dependent upon the daily inflow pattern to the reservoir but appears possible for all runoff simulations with the exception of the Lower Quartile and Lower Decile. Oahe Dam. Releases in the spring and summer will back up those from Gavins Point Dam. The pool level should be steady to rising in the spring during the fish spawn for all runoff scenarios. Fort Randall Dam. To the extent reasonably possible, Fort Randall will be regulated to provide for a pool elevation near 1355 feet msl during the fish spawn period, provided water can be supplied from other reservoirs for downstream uses. The pool will not be drawn down below elevation 1337.5 feet msl in the fall to ensure adequate supply for water intakes. As a measure to minimize take while maintaining the flexibility to increase releases during the nesting season, hourly releases from Fort

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Randall will follow a repetitive daily pattern to limit peak stages below the project for nesting birds. Daily average flows may be increased every third day to preserve the capability of increasing releases later in the summer with little or no incidental take if drier downstream conditions occur. If higher daily releases are required later in the nesting season, the daily peaking pattern may be adjusted, reduced or eliminated resulting in a steady release to avoid increased stages at downstream nesting sites. The need to utilize measures to minimize take may be lessened because of the large quantity of nesting habitat expected during the 2012 nesting season. Periods of zero release will be minimized to the extent reasonably possible during the nesting season given daily average releases, real-time hydrologic conditions, and System generating constraints as defined in coordination with Western Area Power Administration. Gavins Point Dam. March and May spring pulses from Gavins Point Dam for the benefit of the endangered pallid sturgeon will not be implemented under any runoff scenarios in 2012. It is anticipated that sufficient habitat to provide for successful nesting will be available above the planned release rates for all runoff conditions. This expectation is based on experience from the past record runoff in 1997. Following the 1997 runoff, high elevation nesting habitat was readily available and used successfully by the birds. Flows from Gavins Point Dam may follow the flow-to-target (FTT) release scenario. This scenario limits releases from Gavins Point to those needed to meet downstream targets. The actual release scenario will be evaluated when birds begin nesting in early May. If nests are initiated at a lower elevation which would be inundated later in the summer, a steady release-flow to target release scenario may be instituted. A full description of these release scenarios can be found in the Master Manual. Actual releases will be based on hydrologic conditions and the availability of habitat at that time. All reasonable measures to minimize the loss of nesting T&E bird species will be used. While not anticipated because of the large quantity of high elevation habitat available, these measures include, but are not limited to, such things as a relatively high initial steady release during the peak of nest initiation, the use of the Kansas River basin reservoirs, moving nests to higher ground when possible, and monitoring nest fledge dates to determine if delaying an increase a few days might allow threatened chicks to fledge. The location of navigation tows and river conditions at intakes would also be monitored to determine if an increase could be temporarily delayed without impact. Cycling releases every third day may be used to conserve water early in the nesting season if extremely dry conditions develop. In addition, cycling may be used during downstream flood control regulation. The Gavins Point pool will be regulated near 1206.0 feet msl in the spring and early summer, with minor day-to-day variations due to inflows resulting from rainfall

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runoff. Several factors can limit the ability to protect nests from inundation in the upper end of the Gavins Point pool. First, because there are greater numbers of T&E bird species nesting below the Gavins Point project, regulation to minimize incidental take usually involves restricting Gavins Point releases, which means that the Gavins Point pool can fluctuate significantly due to increased runoff from rainfall events. Second, rainfall runoff between Fort Randall Dam and Gavins Point Dam can result in relatively rapid pool rises because the Gavins Point project has a smaller storage capacity than the other System reservoirs. And third, the regulation of Gavins Point for downstream flood control may necessitate immediate release reductions to reduce downstream damage. When combined, all these factors make it difficult and sometimes impossible to prevent inundation of nests in the upper end of the Gavins Point reservoir. However, because of the large quantity of habitat expected we do not anticipate nests being inundated. The pool will be increased to elevation 1207.5 feet msl late in August when it is determined that there are no terns or plovers nesting along the reservoir. G. Regulation Activities for Historic and Cultural Properties. As acknowledged in the 2004 Programmatic Agreement (PA) for the Operation and Management of the Missouri River Main Stem System, wave action and fluctuation in the level of the reservoirs results in erosion along the banks of the reservoirs. The Corps will work with the Tribes utilizing 36 CFR Part 800 and the PA to address the exposure of historic and cultural sites. The objective of a programmatic agreement is to deal “…with the potential adverse effects of complex projects or multiple undertakings…” The PA objective was to collaboratively develop a preservation program that would avoid, minimize and/or mitigate adverse effects along the System reservoirs. All tribes, whether signatory to the PA or not, may request government-to-government consultation on the regulation of the System and the resulting effect on historic and cultural properties and other resources. As a result of the 2011 flood event, there will be impacts to cultural resources. A gradual drawdown of reservoir levels was preferred to avoid or minimize further damage to cultural resource sites. To address impacts, the most effective and comprehensive strategy is a phased approach; site assessment/ Native American Graves Protection and Repatriation Act (NAGPRA) survey, increased law enforcement efforts, engineering design, rip rap repair, and new rip rap placement. Although condition assessments will be conducted for all sites affected by flooding, priority will be given to site assessments at occupation sites to determine impacts and check for any NAGPRA-related items. Increased law enforcement will be necessary to detect or prevent, and possibly prosecute individuals for, Archeological Resources Protection Act (ARPA) violations. Engineers will need to collect data and prepare designs to repair existing rip rap and protection for any sites that were newly impacted. In 2012 reservoir levels are expected to be more normal, but continuing exposure of cultural sites along the shorelines is still possible. Actions to avoid, minimize or

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mitigate adverse impacts and expected results of the actions are covered under Chapter VI of this AOP. Plate 16 shows the locations of the Tribal Reservations.

Fort Peck Dam. Depending on runoff in the Missouri River basin, System regulation during 2012 could result in a Fort Peck pool elevation variation from a high of 2244 feet msl to a low of 2222 feet msl. This is based on the Upper and Lower Decile runoff scenarios (see Plate 8 and the studies included at the end of this report). Based on a review of existing information, approximately 14 known sites could be affected during this period. Garrison Dam. Based on the Upper and Lower Decile runoff scenarios (see Plate 9 and the studies included at the end of this report), Garrison pool elevations could range between 1848 and 1828 feet msl during 2012. Based on a review of existing information, approximately 112 known sites could be affected during this period. Oahe Dam. At the Oahe reservoir, the System regulation under the Upper and Lower Decile runoff scenarios could result in pool elevations ranging from 1616 to 1594 feet msl (see Plate 10 and the studies included at the end of this report). Based on a review of existing information, approximately 221 known sites could be affected during this period. Big Bend Dam. System regulation will be adjusted to maintain the Big Bend pool level in the normal 1420 to 1421 feet msl range during 2012. Short-term increases above 1421 due to local rainfall may also occur. Based on a review of existing information, approximately four known sites could be affected during this period. Fort Randall Dam. As part of the normal System regulation, the Fort Randall pool elevations will vary between 1350 and 1355 feet msl during the spring and summer of 2012. Short-term increases above 1355 feet msl due to local rainfall may occur. The annual fall drawdown of the reservoir to elevation 1337.5 feet msl will begin prior to the close of the navigation season and will be accomplished by early December. The reservoir will then be refilled during the winter to elevation 1350 feet msl. Based on a review of existing information, approximately seven known sites could be affected during this period. Gavins Point Dam. System regulation will be adjusted to maintain the Gavins Point pool level in the normal 1206 to 1207.5 feet msl range during 2012. Short-term increases above 1207.5 feet msl may occur due to local rainfall. Based on a review of existing information, no known sites are expected to be affected during this period.

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VI. SUMMARY OF RESULTS EXPECTED IN 2012

With regulation of the System in accordance with the 2011-2012 AOP outlined in the preceding pages, the following results can be expected. Table III summarizes the critical decision points throughout the year for all runoff conditions.

Table III Summary of 2011-2012 AOP Studies

Decision Points

2011-2012 Runoff Condition

Upper Decile

Upper Quartile

Median

Lower Quartile

Lower Decile

March 1 System Storage March 23-31 GP Release

56.8 MAF 26.7 kcfs

56.8 MAF 26.7 kcfs

56.8 MAF 26.7 kcfs

56.8 MAF 29.8 kcfs

56.8 MAF 29.8 kcfs

March 15 System Storage Spring Service Level

57.8 MAF full service

57.6 MAF full service

57.5 MAF full service

57.3 MAF full service

57.2 MAF full service

May 1 System Storage May Cycling May GP Release

60.2 MAF None 37.0 kcfs

59.7 MAF 28.0/31.6 kcfs 28.7 kcfs

58.4 MAF 28.0/31.6 kcfs 28.7 kcfs

57.2 MAF 31.3/34.3 kcfs 31.9 kcfs

56.8 MAF 31.3/34.3 kcfs 31.9 kcfs

Fish Spawn Rise (Apr-Jun) FTPK Pool Elev Change GARR Pool Elev Change OAHE Pool Elev Change

+8.5 feet +6.5 feet +6.2 feet

+7.1 feet +5.5 feet +6.6 feet

+4.6 feet +5.1 feet +3.3 feet

+2.6 feet +0.8 feet +0.4 feet

+0.7 feet -1.0 feet +0.1 feet

July 1 System Storage Sum-Fall Service Level (kcfs) Nav Season Length

64.8 MAF Full Service 10 Day extension

63.9 MAF Full Service 10 Day extension

61.6 MAF Full Service 0 Days shortening

58.4 MAF Full Service 0 Days shortening

57.2 MAF Full Service 0 Days shortening

September 1 System Storage Winter 2011-12 GP Release

63.0 MAF 20.0 kcfs

62.4 MAF 20.0 kcfs

60.0 MAF 17.0 kcfs

55.9 MAF 13.5 kcfs

54.1 MAF 12.5 kcfs

February 28 System Storage End-Year Pool Balance Percent Pool

56.8 MAF Balanced 100%

56.8 MAF Balanced 100%

56.2 MAF Balanced 98%

51.2 MAF Balanced 85%

48.8 MAF Balanced 79%

25

A. Flood Control. Flood control is the only authorized project purpose that requires the availability of empty storage space rather than impounded water. Actual flood events are generally not predictable well in advance; therefore, detailed routing of specific major flood flows is accomplished when floods occur. There is a recurring pattern of high-risk flood periods during each year: a season when snowmelt, ice jams, and protracted heavy rains will almost surely occur with or without generating consequent floods; and a season when these situations are less likely and the flood threat is correspondingly low. The high-risk flood season begins about March 1st and extends through the summer. As a consequence, regulation of the System throughout the fall and winter months is predicated on the achievement of a March 1st System storage level at or below the base of the annual flood control zone. All runoff scenarios studied for this AOP will begin the March 1, 2012 runoff season at the desired 56.8 MAF base of the annual flood control and multiple use zone. Therefore, the entire System flood control zone of 16.3 MAF, 11.6 MAF in the annual flood control and multiple use zone and 4.7 MAF in exclusive flood control zone, will be available to store surplus runoff. In addition, the Corps is committed to maintaining a flexible posture through the fall and winter of 2011-2012 as the remaining flood water is evacuated from the system. In particular, if conditions throughout the winter indicate that 2012 will be another high runoff year, the Corps will begin early evacuation of water from the system to provide additional storage to the extent that weather and downstream conditions allow which may result in additional flood control capacity at the start of the 2012 runoff season.

To the extent practical, the System is regulated to prevent damaging flows originating above or within the System from contributing to flooding in the downstream reaches of the Missouri River. In 2012, the full capacity of the System will be available to significantly reduce peak discharges and store a significant volume of water for all floods that may originate above the System. The base of the exclusive flood control zone defines the maximum level of storage that will be accumulated for purposes other than flood control. When the exclusive flood control zone at a particular reservoir is encroached upon, the control of subsequent flood inflows becomes the dominant factor. During such periods, releases may substantially exceed the powerplant release capacity with the evacuation rate of any project dependent upon existing flood conditions, the potential for further inflows, and conditions of other reservoirs in the System. Maximum release rates at such times are based upon the Master Manual flood control criteria, the flood control status of the System, and the critical need to preserve the integrity of the dams. Detailed information regarding the adjustments of releases for flood control evacuation and downstream flood control constraints can be found in Chapter 7 of the Master Manual.

26

Being at the base of the annual flood control and multiple use zone at the start of the next runoff year will also provide full support for all of the other multiple purposes of the System. Due to release limitations imposed by the formation of downstream ice cover, a major portion of the required flood control space must be evacuated prior to the winter season. Higher releases may be made on occasions when the downstream channel conditions permit. If plains and/or mountain snowpack accumulations are much above normal during the winter of 2011-2012, releases will be adjusted to the extent reasonably possible to evacuate water from the reservoir system early in the runoff season. High releases during the late winter and early spring periods may exacerbate localized flooding if coincident with plains snowmelt or spring rains, and may also contribute to significant ice jam flooding. Therefore, if higher than normal releases are indicated, local conditions will need to be closely monitored. Flexible scheduling of winter releases and aggressive early spring releases may draw actual system storage below 56.8 MAF prior to March 1, 2012. In addition, all 2012 runoff will be evacuated prior to the start of the 2013 runoff season. B. Water Supply and Water Quality Control. Water supply problems at intakes located in the river reaches both between and below the Mainstem dams and in the reservoirs are related primarily to intake elevations or river access rather than inadequate water supply. In emergency situations, short-term adjustments to protect human health and safety would be considered to keep intakes operational. Low reservoir levels during the 2000-2007 drought contributed to both intake access and water quality problems for intakes on Garrison and Oahe reservoirs, including several Tribal intakes. A return to higher reservoir elevations has eliminated concern over many of these intakes. If the drought re-emerges, reservoir pool levels and releases may decline renewing the potential for intake access and water quality problems at both river and reservoir intakes. Under the Lower Decile runoff scenario, minimum reservoir levels in 2012 would be at least 22 feet higher than the record lows set in the 2000-2007 drought. Although not below the critical shut-down elevations for any intake, return to lower levels would require extra monitoring to ensure the continued operation of the intakes. Above normal Gavins Point releases are being scheduled in the winter of 2011-2012. Under the 2011-2012 runoff scenarios, all water supply and water quality requirements on the Missouri River both below Gavins Point Dam and between System reservoirs should be met for all flow conditions studied. Winter releases for 2012-2013 will be determined based on the September 1, 2012 System storage check. As shown in Table III, 2012-2013 winter releases of 20,000 cfs would be made for a Upper Decile and Upper Quartile runoff scenarios; 17,000 cfs under a Median runoff scenario; 13,500 cfs under Lower Quartile, and 12,500 cfs under Lower Decile runoff scenarios, respectively.

27

Should the 2011-2012 runoff be in the Lower Quartile or Lower Decile range, planned winter release rates may be less than required for downstream water supply intakes without sufficient incremental tributary flows below the System. Should that occur, releases may need to be set higher to ensure that downstream water supply intakes are operable. However, we believe the minimum winter release of 12,000 cfs presented in the Master Manual represents a reasonable long-term goal for water intake operability and for owners to strive for as they make improvements to their facilities. It may be necessary at times to increase Gavins Point releases to provide adequate downstream flows during periods when excessive river ice formation is forecast or if ice jams or blockages form which temporarily restrict flow. Based on past experiences, these events are expected to occur infrequently and be of short duration. During non-navigation periods in the spring and fall from 2004 through 2007, System releases were scheduled as low as 9,000 cfs provided that enough downstream tributary flow existed to allow for continued operation of downstream water intakes. If a non-navigation year would occur in the future, summer releases (May thru August) could average around 18,000 cfs from the System. However, it should be noted that System releases will be set at levels that meet the operational requirements of all water intakes to the extent reasonably possible. Problems have occurred at several downstream intakes in the past, however in all cases the problems have been associated with access to the river or reservoir rather than insufficient water supply. In addition, the low summer release rate would likely result in higher water temperatures in the river, which could impact a power plant’s ability to meet their thermal discharge permits. Again, it should be noted that System releases will be set at levels that allow the downstream power plant to meet their thermal discharge permit requirements to the extent reasonably possible. This may mean that actual System releases in the hottest part of the summer period may be set well above the 18,000 cfs level. The Corps continues to encourage intake operators throughout the System and along the lower river reach to make necessary modifications to their intakes to allow efficient operation over the widest possible range of hydrologic conditions. While the current level of System storage should allow adequate access for all intakes for those intake operators whom had issues or difficulty with access during the past drought years, adjustments should continue to be made during this more normal release period to improve access and flexibility when drought returns to the basin. C. Irrigation. Scheduled releases from the System reservoirs will be sufficient to meet the volumes of flow required for irrigation diversions from the Missouri River. Some access problems may be experienced, however, if Lower Quartile or Lower Decile runoff conditions return. Below Fort Peck, localized dredging may once again be required in the vicinity of irrigation intakes in order to maintain access to the water if releases are low next summer. Tributary irrigation water usage is fully accounted for in the estimates of water supply.

28

D. Navigation. Service to navigation in 2012 will be at full service flow support from the beginning of the navigation season through the July 1 storage check for all runoff scenarios. In addition, all runoff scenarios indicate at least full service and a full navigation season based on the July 1 storage check. Although the AOP simulations provide a comparison of typical flow support under varying runoff conditions, the actual rate of flow support for the 2012 navigation season will be based on actual System storage on March 15 and July 1, 2012. The lower three runoff simulations show a normal 8-month navigation season length and full service flows during 2012. The upper two runoff scenarios indicate a 10-day extension to the navigation season and flows above full service navigation flow support. The anticipated service level and season length for all runoff conditions simulated are shown in Table II. E. Power. Table IV and Table V give the estimated monthly System load requirements and hydropower supply of the Eastern Division, Pick-Sloan Missouri Basin Program (P-S MBP), from September 2011 through December 2012. Estimates of monthly peak demands and energy include customer requirements for firm, short-term firm, summer firm, peaking, and various other types of power sales, System losses, and the effects of diversity. Also included in the estimated requirements are deliveries of power to the Western Division, P-S MBP, to help meet its firm power commitments. Under median runoff, annual generation in 2012 is estimated to be 9.9 million MWh, 106 percent of average.

F. Recreation, Fish and Wildlife. The regulation of the System will continue to provide recreation and fish and wildlife opportunities in the project areas and along the Missouri River as well as other benefits of a managed system. Recreation access is expected to be at normal levels in 2012. If Lower Quartile or Lower Decile runoff were to occur in 2012, boat ramps that were lowered and low water ramps that were constructed during the two recent drought periods will provide adequate reservoir access. Special regulation adjustments incorporating specific objectives for these purposes will be made to the extent reasonably possible. Overall conditions should be favorable for the many visitors who enjoy the camping, boating, fishing, hunting, swimming, picnicking, and other recreational activities associated with the System reservoirs. The effects of the simulated System regulation during 2012 on fish and wildlife are included in Chapter V, Section F, entitled, “Regulation Activities for T&E Species and Fish Propagation Enhancement.” G. Historic and Cultural Properties. As mentioned in Chapter V of this AOP, the regulation of the System during 2011 and 2012 will expose cultural sites due to erosion from the normal fluctuation of pool elevations. The Corps will work with the

29

Tribes utilizing 36 CFR Part 800 and the PA to address the exposure of these sites. The objective of a programmatic agreement is to deal “…with the potential adverse effects of complex projects or multiple undertakings…” The PA objective was to collaboratively develop a preservation program that would avoid, minimize and/or mitigate the adverse affects of the System operation. All tribes, whether signatory to the PA or not, may request government-to-government consultation on the regulation of the System and the resulting effect on historic and cultural properties and other resources.

The planned preservation program for this AOP is outlined by multiple

stipulations in the PA. One of the stipulations, or program components, is the Five-Year Plan. This plan outlines how the Corps will accomplish its responsibilities under the PA and the National Historic Preservation Act. The “Draft Five Year Plan, dated July 2011” (see http://www.nwo.usace.army.mil/CR/) is currently being implemented. The plan includes inventory, testing and evaluation, mitigation and other specific activities that will allow the Corps to avoid, minimize and/or mitigate the adverse effects to cultural sites on Corps lands within the System. Many of the actions listed in the plan are within the elevation ranges that will occur with the implementation of the Master Manual criteria in 2011 and 2012. Two critical components of the Five-Year Plan that are applicable to this AOP are monitoring and mitigation, which will be briefly discussed in the following paragraphs.

First, a collaboratively developed plan, entitled “Draft Monitoring and Enforcement Plan, dated April 2005” (see http://www.nwo.usace.army.mil/CR/) is in place. This monitoring plan outlines the sites that require monitoring and specifies a frequency for monitoring. The Corps is strategically monitoring sites, including those sites within the potential operating pool elevations, to document the effects of the implementation of the 2011-2012 AOP. Specific sites are identified in the draft Monitoring and Enforcement Plan for the monitoring team, comprised of Corps rangers and Tribal monitors, to visit and document impacts. This focused monitoring is resulting in more accurate data on the current impacts to sites along the river plus it is assisting with the identification of sites for mitigation. The most recent training for the monitoring teams was held in August 2011.

Second, mitigation or protection of sites that are being adversely impacted

continues. During the reporting period for the 2010 Annual Report by the Corps on the implementation of the Programmatic Agreement eight sites were either completed, started, or in the design phase. The annual report is available at http://www.nwo.usace.army.mil/CR/. In addition the Corps awarded a contract to develop an erosion model that will compare modeling data against actual erosion data, collected by the monitoring team, to assist in the prioritization of sites for protection. Work on the erosion model was completed in June 2011.

TABLE IVPEAKING CAPABILITY AND SALES

(1,000 kW at plant)

EstimatedCommitted Expected Total

Sales* Expected C of E Capability Expected Bureau Capability** System Capability2011 120% Basic 80% 120% Basic 80% 120% Basic 80%

Sep 2004 2253 2348 2351 202 202 202 2455 2550 2553Oct 1879 2344 2343 2346 202 202 202 2546 2545 2548Nov 1990 2303 2296 2308 201 201 201 2504 2497 2509Dec 2119 2296 2293 2300 198 198 198 2494 2491 2498

2012Jan 2132 2314 2313 2317 195 199 195 2509 2512 2512Feb 2117 2320 2320 2320 193 195 193 2513 2515 2513

U.D. U.Q. Med L.Q. L.D. U.D. U.Q. Med L.Q. L.D. U.D. U.Q. Med L.Q. L.D.

Mar 2050 2329 2329 2324 2319 2318 192 192 192 192 192 2521 2521 2516 2511 2510Apr 1918 2353 2346 2331 2315 2311 189 189 189 190 190 2542 2535 2520 2505 2501May 1878 2370 2365 2338 2314 2308 189 189 190 193 192 2559 2554 2528 2507 2500Jun 2080 2397 2394 2371 2326 2315 201 201 202 198 196 2598 2595 2573 2524 2511Jul 2195 2388 2386 2367 2316 2299 202 202 202 195 201 2590 2588 2569 2511 2500Aug 2198 2374 2373 2357 2295 2274 208 207 208 202 200 2582 2580 2565 2497 2474Sep 2003 2365 2366 2339 2280 2256 208 208 209 205 200 2573 2574 2548 2485 2456Oct 1877 2331 2335 2319 2256 2231 208 208 210 206 200 2539 2543 2529 2462 2431Nov 1988 2292 2297 2284 2218 2192 206 206 207 205 199 2498 2503 2491 2423 2391Dec 2117 2247 2252 2245 2181 2153 202 203 204 201 197 2449 2455 2449 2382 2350

* Estimated sales, including system reserves. Power in addition to hydro production needed for these load requirements will be obtained from other power systems by interchange or purchase.** Total output of Canyon Ferry and 1/2 of the output of Yellowtail powerplant.

TABLE VENERGY GENERATION AND SALES

(Million kWh at plant)

EstimatedCommitted Expected Total

Sales* Expected C of E Generation Expected Bureau Generation ** System Generation2011 120% Basic 80% 120% Basic 80% 120% Basic 80%

Sep 736 1560 1562 1550 110 107 95 1670 1669 1645Oct 737 1198 969 755 102 96 85 1300 1065 840Nov 805 1202 1007 791 81 80 76 1283 1087 867Dec 915 870 812 723 83 82 78 953 894 801

2012

Jan 929 910 809 784 83 82 76 993 891 860Feb 898 831 741 719 77 76 70 908 817 789

U.D. U.Q. Med L.Q. L.D. U.D. U.Q. Med L.Q. L.D. U.D. U.Q. Med L.Q. L.D.

Mar 814 666 663 669 719 724 82 82 80 73 73 748 745 749 792 797Apr 769 777 743 750 874 877 91 91 76 50 50 868 834 826 924 927May 712 1075 920 908 1017 1015 121 114 94 53 53 1196 1034 1002 1070 1068Jun 769 1280 1175 948 1020 1025 140 130 111 55 55 1420 1305 1059 1075 1080Jul 845 1447 1306 1022 1064 1048 144 120 101 58 58 1591 1426 1123 1122 1106Aug 861 1447 1304 1059 1060 1044 108 103 84 53 55 1555 1407 1143 1113 1099Sep 736 1354 1204 913 926 914 96 90 73 51 53 1450 1294 986 977 967Oct 737 1236 1081 742 762 752 86 83 72 51 53 1322 1164 814 813 805Nov 803 1190 1052 664 663 646 86 82 81 65 49 1276 1134 745 728 695Dec 914 848 808 666 598 561 88 84 83 66 51 936 892 749 664 612

CY TOT 13061 11997 9891 10206 10109 1202 1139 1015 722 696 14263 13136 10906 10928 10805

* Estimated sales including system reserves and losses. Power in addition to hydro production needed for these load requirements will be obtained from other systems by interchange or purchase.** Total output Canyon Ferry and 1/2 output of Yellowtail powerplant.

30

31

Results expected from the proposed monitoring and mitigation actions include more accurate horizontal and vertical data on existing cultural sites, detailed impact data, proactive protection and preservation of sites. The effects of the simulated System regulation during 2011-2012 on cultural sites are included in the Chapter V, section G., entitled, “Regulation Activities for Historic and Cultural Properties.”

H. System Storage. If September 1, 2011 Basic runoff forecast verifies, System storage will decline to 57.1 MAF by the close of CY 2011. This would be 23.2 MAF higher than the all-time record low storage of 33.9 MAF set on February 9, 2007 and near last year’s end-of-year storage of 57.0 MAF. This end-of-year storage is 4.5 MAF more than the 1967 to 2010 average. The lowest storage during the 1988-1992 drought was 40.8 MAF in January 1991, and the record low storage was set during the 2000-2007 drought at 33.9 MAF in February 2007. The end-of-year System storages have ranged from a maximum of 60.9 MAF, in 1975, to the 2006 minimum of 34.4 MAF. Forecasted System storage on December 31, 2012 is presented in Table VI for the runoff scenarios simulated. I. Summary of Water Use by Functions. Anticipated water use in CY 2011, under the regulation plan with the Basic forecast of water supply is shown in Table VII. Under the reservoir regulation simulations in this AOP, estimated water use in CY 2012 also is shown in Table VII. Actual water use data for CY 2010 are included for information and comparison.

TABLE VI

ANTICIPATED DECEMBER 31, 2012 SYSTEM STORAGE

Carryover Unfilled Total Water Supply Total Storage Carryover Change Condition (12/31/12) Remaining 1/ Storage 2/ CY 2011

(Volumes in 1,000 Acre-Feet) Upper Decile 57,000 38,900 0 100 Upper Quartile 57,100 38,900 0 200 Median 56,400 38,500 400 -700 Lower Quartile 51,300 33,400 5,500 -6,200 Lower Decile 49,100 31,200 7,700 -8,400

1/ Net usable storage above 17.9 MAF System minimum pool level established for power, recreation, irrigation diversions, and other purposes. 2/ System base of annual flood control zone containing 56.8 MAF.

32

TABLE VII MISSOURI RIVER MAINSTEM SYSTEM

WATER USE FOR CALENDAR YEARS 2010, 2011, AND 2012 ABOVE SIOUX CITY, IOWA in Million Acre-Feet (MAF)

Simulations for CY 2010 CY 2011 Calendar Year 2012 Actual Basic Upper Upper Lower Lower Simulation Decile Quartile Median Quartile Decile Upstream Depletions (1) Irrigation, Tributary Reservoir Evaporation & Other Uses 2.4 2.6 Tributary Reservoir Storage Change -0.1 0.2 Total Upstream Depletions 2.3 2.8 2.5 2.5 2.6 2.5 2.1 System Reservoir Evaporation (2) 3.1 2.7 1.2 1.2 1.8 2.1 2.0 Sioux City Flows Navigation Season Unregulated Flood Inflows Between Gavins Point & Sioux City (3) 0.8 0.8 Navigation Service Requirement (4) 15.3 15.7 17.1 16.6 15.9 16.3 16.0 Supplementary Releases T&E Species (5) 0.5 0.0 0.2 0.2 0.3 0.2 0.2 Flood Evacuation (6) 10.0 34.6 8.4 4.9 0.0 0.0 0.0 Non-navigation Season Flows 3.5 3.8 4.8 4.7 4.6 4.4 4.3 Flood Evacuation Releases (7) 0.5 0.5 0.5 0.4 0.0 0.0 0.0 System Storage Change 0.1 0.1 -0.4 -0.2 -0.8 -6.2 -8.4 Total 38.7 61.0 34.3 30.3 24.4 19.3 16.2 Project Releases Fort Peck 4.1 13.3 8.6 8.0 6.7 6.6 6.6 Garrison 13.2 36.7 20.9 19.4 15.9 16.0 15.5 Oahe 17.2 41.5 24.6 21.9 17.6 18.8 18.9 Big Bend 16.6 40.9 24.5 21.8 17.6 18.9 19.0 Fort Randall 19.2 44.4 25.9 22.9 18.9 19.1 19.2 Gavins Point 21.7 46.5 28.1 24.8 19.6 20.3 20.2

(1) Tributary uses above the 1949 level of development including agricultural depletions and tributary storage effects. (2) Net evaporation is shown for 2012. (3) Incremental inflows to reach which exceed those usable in support of navigation at the target level, even if Gavins

Point releases were held to as low as 6,000 cfs. (4) Estimated requirement for downstream water supply and water quality is approximately 6.0 MAF. (5) Increased releases required for endangered species regulation. (6) Includes flood control releases for flood control storage evacuation and releases used to extend the navigation season

beyond the normal December 1 closing date at the mouth of the Missouri River. (7) Releases for flood control storage evacuation in excess of a 17,000 cfs Gavins Point release.

33

VII. TENTATIVE PROJECTION OF REGULATION THROUGH FEBRUARY 2018 The 5-year extensions to the AOP (March 2013 to March 2018) have been prepared to serve as a guide for the Western Area Power Administration’s marketing activities and to provide data to allow basin interests to conduct long-term planning. Three runoff conditions are modeled in the extension studies: Median, Lower Quartile, and Lower Decile. The full 16.3 MAF of flood control capacity or more was available at the start of each runoff season. The navigation service level and season length criteria described in Plate 3 were applied to the extensions. The March 15 and July 1 System storage checks shown in Plate 3 were used to determine the flow support for navigation and other downstream uses and the navigation season length. A steady release – flow to target (SR-FTT) regulation with cycling in May was modeled during the T&E bird species’ nesting season. The Gavins Point releases to meet navigation target flows, as shown in Plate 3 and as computed by the March 15 and July 1 System storage checks, were used prior to and following the nesting season. The September 1 System storage check was used to determine the winter System release. Navigation service support and season length, magnitudes of March and May spring pulses, March 1 reservoir unbalancing, end of year System storage, and the winter release rate for the extensions are shown on Table VII. The criteria considered as each year of the extensions was modeled are listed, along with the results, in Tables VIII through X for the Median, Lower Quartile, and Lower Decile extension studies, respectively. A. Median Runoff. Studies 9 through 13 present the results of simulating Median runoff (24.4 MAF) from March 2013 through February 2018. The March 1, 2013 System storage would be 56.2 MAF and would drop to 53.4 MAF by March 1, 2018, 3.4 MAF below the desired March 1 storage of 56.8 MAF, the base of the annual flood control and multiple use pool. The navigation service level would range from full service to 100 cfs below full service for the study period of 2013 to 2017. There would be full navigation seasons for the study period of 2013 through 2017. Winter releases would range from 17,000 cfs in the winter of 2013-2014 to 14,500 cfs in winter 2017-2018. March and May spring pulses would occur each year, with the magnitude of the May pulse ranging from 10,000 cfs in 2013 to 10,100 cfs in 2017. The May pulses in the study period of 2013 to 2017 would be limited in order to not exceed downstream flow limits during the pulse. For the entire study period, the carryover multiple use storage in Fort Peck, Garrison, and Oahe was balanced on March 1 each year.

TABLE VIII

NAVIGATION SERVICE SUPPORT, SPRING PULSES, UNBALANCING AOP EXTENSION STUDIES

2013 2014 2015 2016 2017 MEDIAN Annual Runoff Volume (MAF) 24.4 24.4 24.4 24.4 24.4 Spring Pulse March (kcfs) 5.0 5.0 5.0 5.0 5.0 May (kcfs) 10.0* 10.0* 10.0* 10.0* 10.1* Flow Level Below Full Service Spring (kcfs) Full Full Full Full Full-0.1 Summer/Fall (kcfs) Full Full Full Full Full Season Length 8 months 8 months 8 months 8 months 8 months Reservoir Unbalancing (ft) Fort Peck 0 0 0 0 0 Garrison 0 0 0 0 0 Oahe 0 0 0 0 0 Dec 31 Storage (MAF) 55.7 54.9 54.2 53.6 53.3 Winter Release (kcfs) 17.0 17.0 16.5 15.2 14.5 Special Information

LOWER QUARTILE Annual Runoff Volume (MAF) 19.7 20.7 21.5 22.8 24.4 Spring Pulse March (kcfs) 5.0 5.0 5.0 5.0 5.0 May (kcfs) 11.8 11.9 12.2 13.2 14.6 Flow Level Below Full Service Spring (kcfs) Full-2.7 Full-6.0 Full-6.0 Full-6.0 Full-6.0 Summer/Fall (kcfs) Full-3.3 Full-5.4 Full-6.0 Full-5.7 Full-4.3 Season Length 8 mnths 8 mnths-3 days 8 mnths-7 days 8 mnths-4 days 8 mnths Reservoir Unbalancing (ft) Fort Peck 0 0 0 0 0 Garrison 0 0 0 0 0 Oahe 0 0 0 0 0 Dec 31 Storage (MAF) 47.6 46.3 46.1 46.6 48.0 Winter Release (kcfs) 12.5 12.5 12.5 12.5 12.5

LOWER DECILE Annual Runoff Volume (MAF) 16.8 17.1 18.7 19.2 19.4 Spring Pulse March (kcfs) 5.0 5.0 5.0 0 0 May (kcfs) 11.0 10.1 9.5 9.2 0 Flow Level Below Full Service Spring (kcfs) Full-5.5 Full-6.0 Full-6.0 Full-6.0 Full-6.0 Summer/Fall (kcfs) Full-5.9 Full-6.0 Full-6.0 Full-6.0 Full-6.0 Season Length 8 mnths-6 days 8 mnths-30 days 8 mnths-30 days 8 mnths-30 days 8 mnths-30 days Reservoir Unbalancing (ft) Fort Peck 0 0 0 0 0 Garrison 0 0 0 0 0 Oahe 0 0 0 0 0 Dec 31 Storage (MAF) 44.4 41.2 39.4 38.3 37.5 Winter Release (kcfs) 12.5 12.5 12.5 12.5 12.5

* Limited by Downstream Flood-Control Limits. 34

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31/0

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00

00

0 -

Oct

Gav

ins

Poi

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32.0

32.0

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AG

AFP

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mag

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2014

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520

15-2

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2016

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720

17-2

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Mar

ch 1

Sto

rage

MA

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51.2

47.7

46.6

46.3

47.0

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Spr

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Pul

se?

N/A

Yes

Yes

Yes

Yes

Yes

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5 S

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vice

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in S

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3rd

Per

iod

Mar

ch G

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kcfs

29.3

26.0

26.0

26.0

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pril

Gav

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Poi

nt Q

kcfs

27.1

23.8

23.8

23.8

23.8

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1 S

tora

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AF

4052

.149

.148

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May

Spr

ing

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se?

N/A

Yes

Yes

Yes

Yes

Yes

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ulse

Mag

nitu

de*

kcfs

11.8

11.9

12.2

13.2

14.6

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avin

s P

oint

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kcfs

28.6

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625

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325

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25.3

/28.

3 -

May

Gav

ins

Poi

nt Q

kcfs

31.6

28.2

28.2

28.6

29.1

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ne G

avin

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rage

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sFu

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July

Gav

ins

Poi

nt Q

kcfs

31.0

28.9

28.3

28.6

30.0

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ug G

avin

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oint

Qkc

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.728

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.7 -

Sep

t Gav

ins

Poi

nt Q

kcfs

30.2

28.1

27.5

27.8

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1 S

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553

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son

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24.9

21.7

19.6

21.0

24.0

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tem

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F55

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50.8

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Per

cent

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Bal

<22

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31-5

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N/A

No

Yes

Yes

Yes

Yes

Gar

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31-5

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N/A

Yes

Yes

Yes

Yes

Yes

Oah

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MA

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48.8

44.3

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39.5

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N/A

Yes

Yes

Yes

No

No

Mar

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5 S

tora

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AF

31/4

9/54

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vice

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3rd

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iod

Mar

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26.5

26.0

26.0

23.8

23.8

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pril

Gav

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24.3

23.8

23.8

23.8

23.8

May

1 S

tora

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AF

4049

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se?

N/A

Yes

Yes

Yes

Yes

No

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Mag

nitu

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59.

20.

0 -

Gav

ins

Poi

nt C

yclin

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325

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ay G

avin

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June

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28.3

28.3

28.3

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1 S

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50.5

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28.1

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31/0

Thr

esho

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630

3030

30 -

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Gav

ins

Poi

nt Q

kcfs

27.2

23.9

23.9

23.9

23.9

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ov G

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44.3

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39.5

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N/A

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58%

54%

51%

49%

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ance

/Unb

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ceN

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2227

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3/31

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Yes

Yes

Yes

Favo

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Spa

wn

N/A

GA

FP/O

AG

AFP

/OA

GA

* Pul

se m

agni

tude

s ar

e th

e ca

lcul

ated

mag

nitu

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riter

ia a

nd s

imul

ated

mag

nitu

de d

ue to

the

dow

nstre

am fl

ow li

mits

Low

er D

ecile

Ext

ensi

on S

tudi

es -

Crit

eria

Con

side

red

in th

e M

odel

ing

Proc

ess

Tabl

e XI

37

38

B. Lower Quartile Runoff. Studies 14 through 18 show the results of Lower Quartile runoff extensions. System storage on March 1, 2013 would be 51.2 MAF and fall to 48.4 MAF by March 1, 2018. Navigation service levels would range between 2,700 cfs below full service to minimum service for the simulation period 2013 to 2017. The navigation season is shortened no days in 2013, 3 days in 2014, 7 days in 2015, 4 days in 2016, and no shortening in 2017. A 12,500-cfs average winter release is shown for the entire study period. Spring pulses would occur every March and May from 2013 through 2017. Under Lower Quartile runoff, the carryover multiple use storage in the upper three reservoirs would be balanced each March 1. C. Lower Decile Runoff. Studies 19 through 23 show the results of Lower Decile runoff extensions. System storage would be 48.8 MAF on March 1, 2013 and gradually decrease to 37.7 MAF on March 1, 2018. Navigation service levels would be 5,500 cfs below full service at the start of the 2013 season and then drop to 5,900 cfs below full service for the second half of the season. All remaining extension years would have minimum navigation service levels throughout the season. The navigation season would be shortened 6 days in 2013 and 30 days in 2014 through 2017. There are March spring pulses in 2013, 2014, and 2015, May spring pulses in 2013, 2014, 2015, and 2016, and the intrasystem storage is balanced each March 1 for the entire study period. Plate 14 presents System storage, Gavins Point releases, and System peaking capability for Median, Lower Quartile, and Lower Decile runoff for the period 2013 through February 2018. Peak power, or peaking capability, is the amount of power available when all powerplants are operating at maximum. Plate 15 presents reservoir pool elevations for Fort Peck, Garrison, Oahe, and Fort Randall for Median, Lower Quartile, and Lower Decile runoff for the period 2013 through February 2018.

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Summary of Engineering Data -- Missouri River Mainstem System

Item Subject Garrison Dam - Oahe Dam -No. Lake Sakakawea Lake Oahe

1 Location of Dam Near Glasgow, Montana Near Garrison, ND Near Pierre, SD

2 River Mile - 1960 Mileage Mile 1771.5 Mile 1389.9 Mile 1072.3

3 Total & incremental drainage 57,500 181,400 (2) 123,900 243,490 (1) 62,090

areas in square miles

4 Approximate length of full 134, ending near Zortman, MT 178, ending near Trenton, ND 231, ending near Bismarck, ND

reservoir (in valley miles)

5 Shoreline in miles (3) 1520 (elevation 2234) 1340 (elevation 1837.5) 2250 (elevation 1607.5)

6 Average total & incremental 10,200 25,600 15,400 28,900 3,300

inflow in cfs

7 Max. discharge of record 137,000 (June 1953) 348,000 (April 1952) 440,000 (April 1952)

near damsite in cfs

8 Construction started - calendar yr. 1933 1946 19489 In operation (4) calendar yr. 1940 1955 1962

Dam and Embankment

10 Top of dam, elevation in feet msl 2280.5 1875 1660

11 Length of dam in feet 21,026 (excluding spillway) 11,300 (including spillway) 9,300 (excluding spillway)

12 Damming height in feet (5) 220 180 200

13 Maximum height in feet (5) 250.5 210 245

14 Max. base width, total & w/o 3500, 2700 3400, 2050 3500, 1500

berms in feet

15 Abutment formations ( under dam & Bearpaw shale and glacial fill Fort Union clay shale Pierre shale

embankment)

16 Type of fill Hydraulic & rolled earth fill Rolled earth filled Rolled earth fill & shale berms

17 Fill quantity, cubic yards 125,628,000 66,500,000 55,000,000 & 37,000,000

18 Volume of concrete, cubic yards 1,200,000 1,500,000 1,045,00019 Date of closure 24 June 1937 15 April 1953 3 August 1958

Spillway Data

20 Location Right bank - remote Left bank - adjacent Right bank - remote

21 Crest elevation in feet msl 2225 1825 1596.5

22 Width (including piers) in feet 820 gated 1336 gated 456 gated

23 No., size and type of gates 16 - 40' x 25' vertical lift gates 28 - 40' x 29' Tainter 8 - 50' x 23.5' Tainter

24 Design discharge capacity, cfs 275,000 at elev 2253.3 827,000 at elev 1858.5 304,000 at elev 1644.4

25 Discharge capacity at maximum 230,000 660,000 80,000 operating pool in cfs

Reservoir Data (6)

26 Max. operating pool elev. & area 2250 msl 241,000 acres 1854 msl 380,000 acres 1620 msl 374,000 acres

27 Max. normal op. pool elev. & area 2246 msl 234,000 acres 1850 msl 364,000 acres 1617 msl 360,000 acres

28 Base flood control elev & area 2234 msl 210,000 acres 1837.5 msl 307,000 acres 1607.5 msl 312,000 acres

29 Min. operating pool elev. & area 2160 msl 89,000 acres 1775 msl 128,000 acres 1540 msl 117,000 acres

Storage allocation & capacity

30 Exclusive flood control 2250-2246 971,000 a.f. 1854-1850 1,489,000 a.f. 1620-1617 1,102,000 a.f.

31 Flood control & multiple use 2246-2234 2,704,000 a.f. 1850-1837.5 4,222,000 a.f. 1617-1607.5 3,201,000 a.f.

32 Carryover multiple use 2234-2160 10,700,000 a.f. 1837.5-1775 13,130,000 a.f. 1607.5-1540 13,461,000 a.f.

33 Permanent 2160-2030 4,088,000 a.f. 1775-1673 4,980,000 a.f. 1540-1415 5,373,000 a.f.

34 Gross 2250-2030 18,463,000 a.f. 1854-1673 23,821,000 a.f. 1620-1415 23,137,000 a.f.

35 Reservoir filling initiated November 1937 December 1953 August 1958

36 Initially reached min. operating pool 27 May 1942 7 August 1955 3 April 196237 Estimated annual sediment inflow 17,700 a.f. 1030 yrs. 25,900 a.f. 920 yrs. 19,800 a.f. 1170 yrs.

Outlet Works Data

38 Location Right bank Right Bank Right Bank

39 Number and size of conduits 2 - 24' 8" diameter (nos. 3 & 4) 1 - 26' dia. and 2 - 22' dia. 6 - 19.75' dia. upstream, 18.25'

dia. downstream

40 Length of conduits in feet (8) No. 3 - 6,615, No. 4 - 7,240 1529 3496 to 3659

41 No., size, and type of service gates 1 - 28' dia. cylindrical gate 1 - 18' x 24.5' Tainter gate per 1 - 13' x 22' per conduit, vertical

6 ports, 7.6' x 8.5' high (net conduit for fine regulation lift, 4 cable suspension and

opening) in each control shaft 2 hydraulic suspension (fine

regulation)

42 Entrance invert elevation (msl) 2095 1672 1425

43 Avg. discharge capacity per conduit Elev. 2250 Elev. 1854 Elev. 1620

& total 22,500 cfs - 45,000 cfs 30,400 cfs - 98,000 cfs 18,500 cfs - 111,000 cfs44 Present tailwater elevation (ft msl) 2032-2036 5,000 - 35,000 cfs 1670-1680 15,000- 60,000 cfs 1423-1428 20,000-55,000 cfs

Power Facilities and Data

45 Avg. gross head available in feet (14) 194 161 174

46 Number and size of conduits No. 1-24'8" dia., No. 2-22'4" dia. 5 - 29' dia., 25' penstocks 7 - 24' dia., imbedded penstocks

47 Length of conduits in feet (8) No. 1 - 5,653, No. 2 - 6,355 1829 From 3,280 to 4,005

48 Surge tanks PH#1: 3-40' dia., PH#2: 2-65' dia. 65' dia. - 2 per penstock 70' dia., 2 per penstock

49 No., type and speed of turbines 5 Francis, PH#1-2: 128.5 rpm, 5 Francis, 90 rpm 7 Francis, 100 rpm

1-164 rpm , PH#2-2: 128.6 rpm

50 Discharge cap. at rated head in cfs PH#1, units 1&3 170', 2-140' 150' 41,000 cfs 185' 54,000 cfs

8,800 cfs, PH#2-4&5 170'-7,200 cfs

51 Generator nameplate rating in kW 1&3: 43,500; 2: 18,250; 4&5: 40,000 3 - 121,600, 2 - 109,250 112,290

52 Plant capacity in kW 185,250 583,300 786,030

53 Dependable capacity in kW (9) 181,000 388,000 534,000

54 Avg. annual energy, million kWh (12) 1,043 2,245 2,61855 Initial generation, first and last unit July 1943 - June 1961 January 1956 - October 1960 April 1962 - June 1963

56 Estimated cost September 1999 completed project (13) $158,428,000 $305,274,000 $346,521,000

Fort Peck Dam -Fort Peck Lake

.

Summary of Engineering Data -- Missouri River Mainstem SystemBig Bend Dam - Fort Randall Dam - Gavins Point Dam - Total Item Remarks

Lake Sharpe Lake Francis Case Lewis & Clark Lake No.

21 miles upstream Chamberlain, SD Near Lake Andes, SD Near Yankton, SD 1 (1) Includes 4,280 square

Mile 987.4 Mile 880.0 Mile 811.1 2 miles of non-contributing

249,330 (1) 5,840 263,480 (1) 14,150 279,480 (1) 16,000 3 areas.

(2) Includes 1,350 square

80, ending near Pierre, SD 107, ending at Big Bend Dam 25, ending near Niobrara, NE 755 miles 4 miles of non-contributing

areas.

200 (elevation 1420) 540 (elevation 1350) 90 (elevation 1204.5) 5,940 miles 5 (3) With pool at base of flood

28,900 30,000 1,100 32,000 2,000 6 control.

(4) Storage first available for

440,000 (April 1952) 447,000 (April 1952) 480,000 (April 1952) 7 regulation of flows.

(5) Damming height is height

1959 1946 1952 8 from low water to maximum1964 1953 1955 9 operating pool. Maximum

height is from average

1440 1395 1234 10 streambed to top of dam.

10,570 (including spillway) 10,700 (including spillway) 8,700 (including spillway) 71,596 11 (6) Based on latest available

78 140 45 863 feet 12 storage data.

95 165 74 13 (7) River regulation is attained

1200, 700 4300, 1250 850, 450 14 by flows over low-crested

spillway and through

Pierre shale & Niobrara chalk Niobrara chalk Niobrara chalk & Carlile shale 15 turbines.

(8) Length from upstream face

Rolled earth, shale, chalk fill Rolled earth fill & chalk berms Rolled earth & chalk fill 16 of outlet or to spiral case.

17,000,000 28,000,000 & 22,000,000 7,000,000 358,128,000 cu. yds 17 (9) Based on 8th year (1961)

540,000 961,000 308,000 5,554,000 cu. yds. 18 of drought drawdown24 July 1963 20 July 1952 31 July 1955 19 (From study 8-83-1985).

(10) Affected by level of Lake

Left bank - adjacent Left bank - adjacent Right bank - adjacent 20 Francis case. Applicable to

1385 1346 1180 21 pool at elevation 1350.

376 gated 1000 gated 664 gated 22 (11) Spillway crest.

8 - 40' x 38' Tainter 21 - 40' x 29' Tainter 14 - 40' x 30' Tainter 23 (12) 1967-2010 Average

390,000 at elev 1433.6 633,000 at elev 1379.8 584,000 at elev 1221.4 24 (13) Source: Annual Report on

270,000 508,000 345,000 25 Civil Works Activities of theCorps of Engineers. Extract

Report Fiscal Year 1999.

1423 msl 61,000 acres 1375 msl 102,000 acres 1210 msl 30,000 acres 1,188,000 acres 26 (14) Based on Study 8-83-1985

1422 msl 60,000 acres 1365 msl 95,000 acres 1208 msl 27,000 acres 1,140,000 acres 27

1420 msl 57,000 acres 1350 msl 77,000 acres 1204.5 msl 23,000 acres 986,000 acres 28

1415 msl 51,000 acres 1320 msl 38,000 acres 1204.5 msl 23,000 acres 446,000 acres 29

1423-1422 60,000 a.f. 1375-1365 985,000 a.f. 1210-1208 57,000 a.f. 4,664,000 a.f. 30

1422-1420 117,000 a.f. 1365-1350 1,309,000 a.f. 1208-1204.5 86,000 a.f. 11,639,000 a.f. 31

1350-1320 1,607,000 a.f. 38,898,000 a.f. 32

1420-1345 1,621,000 a.f. 1320-1240 1,517,000 a.f. 1204.5-1160 307,000 a.f. 17,886,000 a.f. 33

1423-1345 1,798,000 a.f. 1375-1240 5,418,000 a.f. 1210-1160 450,000 a.f. 73,087,000 a.f. 34

November 1963 January 1953 August 1955 35

25 March 1964 24 November 1953 22 December 1955 365,300 a.f. 430 yrs. 18,400 a.f. 250 yrs. 2,600 a.f. 180 yrs. 89,700 a.f. 37

Left Bank 38

None (7) 4 - 22' diameter None (7) 39

1013 40

2 - 11' x 23' per conduit, vertical 41

lift, cable suspension

1385 (11) 1229 1180 (11) 42

Elev 1375 43

32,000 cfs - 128,000 cfs1351-1355(10) 25,000-100,000 cfs 1228-1239 5,000-60,000 cfs 1155-1163 15,000-60,000 cfs 44

70 117 48 764 feet 45

None: direct intake 8 - 28' dia., 22' penstocks None: direct intake 46

1,074 55,083 47

None 59' dia, 2 per alternate penstock None 48

8 Fixed blade, 81.8 rpm 8 Francis, 85.7 rpm 3 Kaplan, 75 rpm 36 units 49

67' 103,000 cfs 112' 44,500 cfs 48' 36,000 cfs 50

3 - 67,276, 5 - 58,500 40,000 44,100 51

494,320 320,000 132,300 2,501,200 kw 52

497,000 293,000 74,000 1,967,000 kw 53 Corps of Engineers, U.S. Army

969 1,729 727 9,331 million kWh 54 Compiled byOctober 1964 - July 1966 March 1954 - January 1956 September 1956 - January 1957 July 1943 - July 1966 55 Northwestern Division

56 Missouri River Region$107,498,000 $199,066,000 $49,617,000 $1,166,404,000 August 2011

Plate 2

Plate 3 Summary of Master Manual Technical Criteria

NAVIGATION TARGET FLOWS

Location Minimum Service (kcfs) Full Service (kcfs) Sioux City 25 31 Omaha 25 31 Nebraska City 31 37 Kansas City 35 41

RELATION OF SYSTEM STORAGE TO NAVIGATION SERVICE LEVEL Date System Storage (MAF) Navigation Service Level March 15 54.5 or more 35,000 cfs (full-service) March 15 49.0 to 31 29,000 cfs (minimum-service) March 15 31.0 or less No navigation service July 1 57.0 or more 35,000 cfs (full-service) July 1 50.5 or less 29,000 cfs (minimum-service)

RELATION OF SYSTEM STORAGE TO NAVIGATION SEASON LENGTH Final Day of Navigation Support

Date System Storage (MAF) at Mouth of the Missouri River July 1 51.5 or more November 30 (8-month season) July 1 46.8 through 41.0 October 31 (7-month season) July 1 36.5 or less September 30 (6-month season)

GAVINS POINT RELEASES NEEDED TO MEET TARGET FLOWS 1950 to 1996 Data (kcfs)

Median, Upper Quartile, Upper Decile Runoff Apr May Jun Jul Aug Sep Oct Nov

Full Service 26.7 28.0 27.9 31.6 33.2 32.6 32.0 31.1 Minimum Service 20.7 22.0 21.9 25.6 27.2 26.6 26.0 25.1

Lower Quartile, Lower Decile Runoff Apr May Jun Jul Aug Sep Oct Nov

Full Service 29.8 31.3 31.2 34.3 34.0 33.5 33.1 31.2 Minimum Service 23.8 25.3 25.2 28.3 28.0 27.5 27.1 25.2

RESERVOIR UNBALANCING SCHEDULE Fort Peck Garrison Oahe

Year March 1 Rest of Year March 1 Rest of Year March 1 Rest of Year

1 High Float Low Hold Peak Raise & hold during spawn Float

2 Raise & hold during spawn Float High Float Low Hold peak

3 Low Hold peak Raise & hold during spawn Float High Float

Notes: Float year: Normal regulation, then unbalance 1 foot during low pool years or 3 feet when System storage is near 57.0 MAF on March 1.

Low year: Begin low, then hold peak the remainder of the year. High year: Begin high, raise and hold pool during spawn, then float.

MRNRC RECOMMENDED RESERVOIR ELEVATION GUIDELINES FOR UNBALANCING Fort Peck Garrison Oahe Implement unbalancing if March 1 pool is above this level.

2234 feet msl

1837.5 feet msl

1607.5 feet msl

Implement unbalancing if March 1 pool level is in this range and the pool is expected to raise more than 3 feet after March 1.

2227-2234 feet msl

1827-1837.5

feet msl

1600-1607.5

feet msl

Scheduling Criteria Avoid pool level decline during spawn period which ranges from April 15 – May 30

Schedule after spawn period of April 20 – May 20

Schedule after spawn period of April 8 – May 15

Plate 3 (cont’d) Summary of Master Manual Technical Criteria

TECHNICAL CRITERIA FOR SPRING PULSES FROM GAVINS POINT DAM

Criteria Applicable to Both the March and May Spring Pulses Flood Control Constraints No change from current levels

Criteria Applicable to the March Spring Pulse Drought Preclude 40.0 MAF or below measured on March 1. Drought Proration of None, 5 kcfs added to navigation releases, Pulse Magnitude* but no greater than 35 kcfs. Initiation of Pulse Extend the stepped System release increases that precede the beginning of the

navigation season. Rate of Rise before Peak Approximately 5 kcfs for 1 day. Duration of Peak Two days. Rate of Fall after Peak Drop over 5 days to navigation target release.

Criteria Applicable to Time Period Between the Bimodal Pulses Release Existing Master Manual Criteria

Criteria Applicable to the May Spring Pulse Drought Preclude 40.0 MAF or below measured on May 1. Proration of Prorated from 16 kcfs based on a May 1 System Pulse Magnitude Based Storage check; 100% at 54.5 MAF; straight line On System Storage* interpolation to 75% at 40.0 MAF. Proration of After the proration of the spring pulse magnitude for Pulse Magnitude Based System Storage, the resultant magnitude would be On Projected Runoff* further adjusted either up or down based on the May CY runoff forecast; 100%

for Median; straight-line interpolation to 125% at Upper Quartile runoff; 125% for runoff above Upper Quartile; straight-line interpolation to 75% at Lower Quartile runoff; 75% for runoff below Lower Quartile.

Initiation of Pulse Between May 1 to May 19, depending on Missouri River water temperature

immediately below Gavins Point Dam. If possible, pulse will be initiated after the second daily occurrence of a 16 degree Celsius water temperature; however, the decision will be informed by the potential for ‘take’ of Threatened and Endangered bird species.

Rate of Rise before Peak Approximately 6 kcfs per day. Duration of Peak Two days. Rate of Fall after Peak Approximately 30% drop over 2 days followed by a proportional reduction in

releases back to the existing Master Manual criteria over an 8-day period.

Spring Pulse Downstream Flow Limits Omaha 41,000 cfs Nebraska City 47,000 cfs Kansas City 71,000 cfs * Spring pulse magnitudes will be determined by taking the difference between pre-pulse Gavins Point releases and the peak pulse Missouri River flows measured just downstream of the mouth of the James River.

40

45

50

55

60

65

70

75

J F M A M J J A S O N D J F M A M J J A S O N D J F

System Storage 2011-2012 AOP

Top Exclusive Flood Control – 73.1 maf

Base Exclusive Flood Control – 68.4 maf

Storage in MAF

Base Flood Control – 56.8 maf

2011 2012 2013 Average 1967-2010

Fort Peck 2011-2012 AOP

2220

2225

2230

2235

2240

2245

2250

2255

J F M A M J J A S O N D J F M A M J J A S O N D J F

Average 1967-2010

Elevation, feet msl

Plate 4

upper decile

lower decile

median

upper decile

median

lower decile

Average

Average

Top Exclusive Flood Control – 2250

Base Exclusive Flood Control – 2246

Base Flood Control – 2234

Actual

Actual

2011 2012 2013

Average 1967-2010 Plate 5

Average 1967-2010

Oahe 2011-2012 AOP

1590

1595

1600

1605

1610

1615

1620

1625

1630

J F M A M J J A S O N D J F M A M J J A S O N D J F

Elevation, feet msl

upper decile

median

lower decile

Average

Top Exclusive Flood Control – 1620

Base Exclusive Flood Control – 1617

Base Flood Control – 1607.5

Garrison 2011-2012 AOP

1820

1825

1830

1835

1840

1845

1850

1855

1860

J F M A M J J A S O N D J F M A M J J A S O N D J F

Elevation, feet msl

upper decile

median

lower decile Average

Base Exclusive Flood Control – 1850

Base Flood Control – 1837.5

Top Exclusive Flood Control – 1854

Actual

Actual

2011 2012 2013

2011 2012 2013

Syst

em S

tora

ge

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

0481216202428323640444852566064687276

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

0481216202428323640444852566064687276

0481216202428323640444852566064687276Storage in million acre-feetStorage in million acre-feet

Top

of

Exc

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Bas

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Exc

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Con

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Bas

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Ann

ual F

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Poo

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Upp

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Med

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Low

er Q

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Dec

ile

Act

ual

Bas

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Gav

ins

Poi

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elea

ses

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

081624324048566472808896104

112

120

128

136

144

152

160

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

081624324048566472808896104

112

120

128

136

144

152

160

081624324048566472808896104

112

120

128

136

144

152

160

Flow in thousand cfsFlow in thousand cfs

Pla

te 7

Upp

er Q

uart

ileU

pper

Dec

ile

Med

ian

Low

er Q

uart

ileL

ower

Dec

ile

Act

ual

Bas

ic

For

t P

eck

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

2160

2170

2180

2190

2200

2210

2220

2230

2240

2250

2260

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

2160

2170

2180

2190

2200

2210

2220

2230

2240

2250

2260

2160

2170

2180

2190

2200

2210

2220

2230

2240

2250

2260

Elevation in feet mslElevation in feet msl

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

051015202530354045505560

Releases in thousand cfs

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

051015202530354045505560

051015202530354045505560

Releases in thousand cfsE

leva

tion

s an

d R

elea

ses

Top

of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Ann

ual F

lood

Con

trol

Top

of

Per

man

ent

Poo

l

Plat

e 8

Upp

er Q

uart

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pper

Dec

ile

Med

ian

Low

er Q

uart

ile

Low

er D

ecile

Act

ual

Bas

ic

Gar

riso

n

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

1775

1785

1795

1805

1815

1825

1835

1845

1855

1865

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

1775

1785

1795

1805

1815

1825

1835

1845

1855

1865

1775

1785

1795

1805

1815

1825

1835

1845

1855

1865

Elevation in feet mslElevation in feet msl

5355

5759

6163

6567

6971

7376

7880

8284

8688

9092

9395

9799

0103

0507

09

Cal

enda

r Y

ear

0102030405060708090100

110

120

130

140

Releases in thousand cfs

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

0102030405060708090100

110

120

130

140

0102030405060708090100

110

120

130

140

Releases in thousand cfsE

leva

tion

s an

d R

elea

ses

Top

of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Ann

ual F

lood

Con

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Top

of

Per

man

ent

Poo

l

Plat

e 9

Upp

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uart

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pper

Dec

ile

Med

ian

Low

er Q

uart

ile

Low

er D

ecile

Act

ual

Bas

ic

Oah

e

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

1540

1550

1560

1570

1580

1590

1600

1610

1620

1630

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

1540

1550

1560

1570

1580

1590

1600

1610

1620

1630

1540

1550

1560

1570

1580

1590

1600

1610

1620

1630

Elevation in feet mslElevation in feet msl

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

0102030405060708090100

110

120

130

140

150

Releases in thousand cfs

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

0102030405060708090100

110

120

130

140

150

0102030405060708090100

110

120

130

140

150

Releases in thousand cfsE

leva

tion

s an

d R

elea

ses

Top

of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Ann

ual F

lood

Con

trol

Top

of

Per

man

ent P

ool

Plat

e 10

Upp

er Q

uart

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pper

Dec

ile

Med

ian

Low

er Q

uart

ile

Low

er D

ecile

Act

ual

Bas

ic

For

t R

anda

ll

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

1320

1330

1340

1350

1360

1370

1380

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

1320

1330

1340

1350

1360

1370

1380

1320

1330

1340

1350

1360

1370

1380

Elevation in feet mslElevation in feet msl

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

020406080100

120

140

160

Releases in thousand cfs

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

SO

ND

2011

2012

020406080100

120

140

160

020406080100

120

140

160

Releases in thousand cfsE

leva

tion

s an

d R

elea

ses

Top

of

Exc

lusi

ve F

lood

Con

trol

Bas

e of

Exc

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Con

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Bas

e of

Ann

ual F

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Con

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Top

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Per

man

ent

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1

Upp

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Dec

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Med

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Low

er Q

uart

ile

Low

er D

ecile

Act

ual

Bas

ic

Pla

te 1

2

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Jul

2010

2011

020406080100

120

Flow

in 1

000

cfs

Act

ual R

egul

ated

Flo

w

Unr

egul

ated

Flo

w

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Jul

2010

2011

050100

150

200

250

300

Flow

in 1

000

cfs

Act

ual R

egul

ated

Flo

w

Unr

egul

ated

Flo

w

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Jul

2010

2011

050100

150

200

250

Flow

in 1

000

cfs

Act

ual

Reg

ulat

ed F

low

Unr

egul

ated

Flo

w

Res

ervo

ir R

elea

se a

nd

Un

regu

late

d F

low

Fort

Pec

k

Gav

ins

Poi

nt

Oah

e

Gar

riso

n

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Jul

2010

2011

050100

150

200

250

300

Flow

in 1

000

cfs

Act

ual R

egul

ated

Flo

w

Unr

egul

ated

Flo

w

Syst

em G

ross

Cap

abili

ty a

nd A

vera

ge M

onth

ly G

ener

atio

n

5355

5759

6163

6567

6971

7375

7779

8183

8587

8991

9395

9799

0103

0507

0911

Cal

enda

r Y

ear

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

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DATE OF STUDY 11/30/11 SEP 1, 2011 / BASIC CONDITION / 61.0 MAF / BALANCED 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 NAV SEASON 10-DAY EXTENSION STUDY NO 1 VALUES IN 1000 AF EXCEPT AS INDICATED 31AUG11 2011 2012 INI-SUM 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB --FORT PECK-- NAT INFLOW 2235 450 400 192 90 102 329 312 360 DEPLETION -903 -177 -130 -67 -31 -36 -151 -166 -145 EVAPORATION 352 115 98 44 21 23 51 MOD INFLOW 2786 512 432 215 100 115 429 478 505 RELEASE 4530 1398 553 268 125 143 615 738 690 STOR CHANGE -1744 -886 -121 -53 -25 -28 -186 -260 -185 STORAGE 16537 15651 15529 15476 15452 15424 15238 14978 14793 ELEV FTMSL 2241.9 2238.0 2237.4 2237.2 2237.1 2237.0 2236.1 2234.9 2234.0 DISCH KCFS 24.5 23.5 9.0 9.0 9.0 9.0 10.0 12.0 12.0 POWER AVE POWER MW 166 124 124 124 124 137 160 159 PEAK POW MW 164 165 165 164 164 164 163 162 ENERGY GWH 632.1 119.2 92.3 44.6 20.8 23.8 101.9 118.9 110.7 --GARRISON-- NAT INFLOW 2512 700 550 199 93 106 247 261 356 DEPLETION -731 -219 -48 -112 -52 -60 -108 -77 -55 CHAN STOR 120 10 140 -10 -20 EVAPORATION 404 132 114 51 23 27 57 REG INFLOW 7489 2195 1178 528 247 282 903 1056 1101 RELEASE 9723 2552 1599 774 361 413 1168 1476 1381 STOR CHANGE -2233 -357 -421 -245 -114 -131 -266 -420 -279 STORAGE 20348 19991 19570 19324 19210 19079 18814 18394 18115 ELEV FTMSL 1844.4 1843.3 1842.1 1841.3 1841.0 1840.6 1839.7 1838.4 1837.5 DISCH KCFS 74.0 42.9 26.0 26.0 26.0 26.0 19.0 24.0 24.0 POWER AVE POWER MW 499 331 329 329 328 240 300 298 PEAK POW MW 498 486 482 481 479 476 472 468 ENERGY GWH 1451.2 359.0 245.9 118.4 55.2 63.0 178.5 223.5 207.6 --OAHE-- NAT INFLOW 372 130 70 35 16 19 12 90 DEPLETION 92 28 -9 2 1 1 15 21 33 CHAN STOR 189 115 66 27 -20 EVAPORATION 396 130 110 50 23 26 56 REG INFLOW 9796 2640 1633 757 353 404 1124 1447 1438 RELEASE 11701 4041 1507 830 420 589 1556 1449 1308 STOR CHANGE -1905 -1401 126 -74 -67 -185 -432 -2 129 STORAGE 20744 19343 19469 19395 19328 19143 18712 18710 18839 ELEV FTMSL 1613.3 1609.1 1609.5 1609.3 1609.1 1608.5 1607.1 1607.1 1607.5 DISCH KCFS 80.0 67.9 24.5 27.9 30.3 37.1 25.3 23.6 22.7 POWER AVE POWER MW 725 319 363 393 480 327 303 293 PEAK POW MW 714 719 717 716 713 706 706 708 ENERGY GWH 1721.5 522.0 237.5 130.7 66.0 92.2 243.2 225.7 204.1 --BIG BEND-- EVAPORATION 77 25 22 10 5 5 11 REG INFLOW 11624 4016 1486 821 415 584 1545 1449 1308 RELEASE 11583 3975 1486 821 415 584 1545 1449 1308 STORAGE 1580 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1419.3 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 80.0 66.8 24.2 27.6 29.9 36.8 25.1 23.6 22.7 POWER AVE POWER MW 311 118 138 149 183 126 116 109 PEAK POW MW 511 538 538 538 538 538 538 529 ENERGY GWH 677.0 223.8 88.0 49.6 25.1 35.0 93.5 86.0 75.9 --FORT RANDALL-- NAT INFLOW 262 140 18 9 4 5 12 25 49 DEPLETION 19 7 1 1 0 1 3 3 3 EVAPORATION 85 33 25 9 4 4 10 REG INFLOW 11742 4075 1478 820 415 583 1546 1471 1354 RELEASE 12709 4619 2253 1142 531 607 1455 1121 980 STOR CHANGE -967 -544 -776 -322 -116 -24 91 350 374 STORAGE 4074 3530 2755 2433 2317 2292 2383 2733 3107 ELEV FTMSL 1361.1 1355.0 1344.9 1339.9 1337.9 1337.4 1339.0 1344.6 1349.8 DISCH KCFS 87.0 77.6 36.6 38.4 38.3 38.3 23.7 18.2 17.0 POWER AVE POWER MW 361 294 283 271 267 172 138 135 PEAK POW MW 350 319 296 287 285 292 318 338 ENERGY GWH 1002.0 259.7 218.9 101.8 45.5 51.2 128.3 102.5 94.1 --GAVINS POINT-- NAT INFLOW 740 150 140 60 28 32 100 100 130 DEPLETION 18 -5 2 5 2 3 10 1 CHAN STOR 130 18 76 -3 0 0 27 10 2 EVAPORATION 27 9 8 3 2 2 4 REG INFLOW 13533 4783 2460 1190 555 635 1568 1230 1112 RELEASE 13548 4760 2460 1190 555 635 1568 1230 1150 STOR CHANGE -15 23 -38 STORAGE 357 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.6 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 90.0 80.0 40.0 40.0 40.0 40.0 25.5 20.0 20.0 POWER AVE POWER MW 109 116 116 116 116 89 71 70 PEAK POW MW 111 116 116 116 116 117 117 114 ENERGY GWH 416.6 78.4 86.7 41.9 19.6 22.4 66.6 52.5 48.7 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1182 400 300 100 47 53 150 40 92 DEPLETION 88 24 11 6 3 3 13 14 14 REGULATED FLOW AT SIOUX CITY KAF 14642 5136 2749 1284 599 685 1705 1256 1228 KCFS 86.3 44.7 43.2 43.2 43.2 27.7 20.4 21.4 --TOTAL-- NAT INFLOW 7303 1970 1478 595 278 317 838 750 1077 DEPLETION -1417 -342 -173 -165 -77 -88 -218 -204 -150 CHAN STOR 440 143 282 -2 0 -1 46 -29 2 EVAPORATION 1341 443 376 168 77 88 189 STORAGE 63640 60516 59323 58629 58307 57939 57147 56816 56817 SYSTEM POWER AVE POWER MW 2169 1303 1353 1382 1498 1092 1087 1065 PEAK POW MW 2348 2343 2314 2303 2296 2293 2313 2320 ENERGY GWH 5900.5 1562.0 969.3 487.1 232.1 287.6 812.1 809.1 741.2 DAILY GWH 52.1 31.3 32.5 33.2 35.9 26.2 26.1 25.6 INI-SUM 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB

DATE OF STUDY 11/30/11 SEP 1, 2011 / UPPER BASIC / 62.1 MAF / BALANCED 99001 9901 9901 PAGE 1 TIME OF STUDY 13:48:14 NAV SEASON 10-DAY EXTENSION STUDY NO 2 VALUES IN 1000 AF EXCEPT AS INDICATED 31AUG11 2011 2012 INI-SUM 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB --FORT PECK-- NAT INFLOW 2682 540 480 231 108 123 395 374 432 DEPLETION -935 -194 -176 -74 -34 -39 -141 -163 -114 EVAPORATION 234 87 74 18 8 9 38 MOD INFLOW 3383 647 582 286 134 153 498 537 546 RELEASE 5133 1405 769 372 174 190 676 799 748 STOR CHANGE -1750 -758 -187 -85 -40 -38 -178 -262 -202 STORAGE 16537 15779 15592 15507 15467 15429 15251 14988 14787 ELEV FTMSL 2241.9 2238.6 2237.7 2237.3 2237.2 2237.0 2236.2 2234.9 2234.0 DISCH KCFS 24.5 23.6 12.5 12.5 12.5 12.0 11.0 13.0 13.0 POWER AVE POWER MW 166 165 165 165 161 149 163 162 PEAK POW MW 165 165 165 165 164 164 163 162 ENERGY GWH 705.6 119.3 122.9 59.3 27.7 30.9 110.9 121.5 113.1 --GARRISON-- NAT INFLOW 3014 840 660 239 112 127 296 313 427 DEPLETION -697 -220 -31 -110 -51 -58 -107 -74 -46 CHAN STOR 111 8 107 5 10 -20 EVAPORATION 268 100 86 20 9 11 43 REG INFLOW 8687 2374 1481 700 327 371 1046 1167 1221 RELEASE 10926 2655 1968 952 444 460 1353 1599 1496 STOR CHANGE -2239 -281 -486 -252 -117 -90 -307 -432 -275 STORAGE 20348 20067 19581 19329 19212 19122 18815 18383 18109 ELEV FTMSL 1844.4 1843.6 1842.1 1841.3 1841.0 1840.7 1839.8 1838.4 1837.5 DISCH KCFS 74.0 44.6 32.0 32.0 32.0 29.0 22.0 26.0 26.0 POWER AVE POWER MW 499 406 405 404 366 277 325 323 PEAK POW MW 498 486 482 481 480 476 471 468 ENERGY GWH 1617.8 359.0 302.1 145.6 67.9 70.2 206.5 241.9 224.7 --OAHE-- NAT INFLOW 446 156 84 42 20 22 14 108 DEPLETION 92 28 -9 2 1 1 15 21 33 CHAN STOR 181 109 49 12 27 -16 EVAPORATION 265 99 84 20 9 10 43 REG INFLOW 11196 2793 2025 972 454 483 1323 1576 1571 RELEASE 13108 3965 2035 1070 532 717 1611 1675 1502 STOR CHANGE -1911 -1172 -10 -98 -79 -234 -288 -99 69 STORAGE 20744 19572 19563 19465 19386 19151 18863 18764 18833 ELEV FTMSL 1613.3 1609.8 1609.8 1609.5 1609.2 1608.5 1607.6 1607.3 1607.5 DISCH KCFS 80.0 66.6 33.1 36.0 38.4 45.2 26.2 27.2 26.1 POWER AVE POWER MW 727 431 468 497 583 339 351 336 PEAK POW MW 718 720 718 717 713 708 707 708 ENERGY GWH 1955.2 523.5 320.5 168.3 83.5 112.0 252.0 261.1 234.2 --BIG BEND-- EVAPORATION 51 18 16 4 2 2 9 REG INFLOW 13057 3947 2019 1067 531 715 1602 1675 1502 RELEASE 13016 3906 2019 1067 531 715 1602 1675 1502 STORAGE 1580 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1419.3 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 80.0 65.6 32.8 35.8 38.2 45.1 26.1 27.2 26.1 POWER AVE POWER MW 305 160 178 189 223 130 133 125 PEAK POW MW 511 538 538 538 538 538 538 529 ENERGY GWH 760.8 219.9 119.1 64.1 31.8 42.7 96.9 99.2 87.0 --FORT RANDALL-- NAT INFLOW 315 168 22 11 5 6 14 30 59 DEPLETION 19 7 1 1 0 1 3 3 3 EVAPORATION 58 25 19 4 2 2 7 REG INFLOW 13256 4042 2021 1073 534 718 1608 1702 1558 RELEASE 14214 4586 2794 1394 649 742 1512 1352 1184 STOR CHANGE -958 -544 -773 -321 -116 -24 96 350 374 STORAGE 4074 3530 2757 2436 2320 2296 2392 2742 3116 ELEV FTMSL 1361.1 1355.0 1344.9 1339.9 1337.9 1337.5 1339.2 1344.7 1349.9 DISCH KCFS 87.0 77.1 45.4 46.9 46.8 46.8 24.6 22.0 20.6 POWER AVE POWER MW 361 333 308 292 286 179 166 163 PEAK POW MW 350 319 296 287 285 293 318 339 ENERGY GWH 1092.6 259.7 247.8 110.7 49.0 54.9 133.4 123.5 113.5 --GAVINS POINT-- NAT INFLOW 889 180 168 73 34 39 120 120 156 DEPLETION 18 -5 2 5 2 3 10 1 CHAN STOR 123 19 59 -3 0 0 41 5 3 EVAPORATION 18 6 6 1 1 1 3 REG INFLOW 15191 4783 3013 1458 680 778 1660 1476 1343 RELEASE 15206 4760 3013 1458 680 778 1660 1476 1381 STOR CHANGE -15 23 -38 STORAGE 357 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.6 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 90.0 80.0 49.0 49.0 49.0 49.0 27.0 24.0 24.0 POWER AVE POWER MW 109 116 116 116 116 95 84 83 PEAK POW MW 111 116 116 116 116 117 117 114 ENERGY GWH 438.7 78.4 85.9 41.6 19.4 22.2 70.4 62.7 58.1 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1418 480 360 120 56 64 180 48 110 DEPLETION 88 24 11 6 3 3 13 14 14 REGULATED FLOW AT SIOUX CITY KAF 16536 5216 3362 1572 734 838 1827 1510 1477 KCFS 87.7 54.7 52.8 52.8 52.8 29.7 24.6 25.7 --TOTAL-- NAT INFLOW 8764 2364 1774 715 334 381 1005 899 1292 DEPLETION -1415 -360 -202 -169 -79 -90 -207 -198 -110 CHAN STOR 417 136 215 -2 0 16 80 -31 3 EVAPORATION 894 334 285 67 31 35 143 STORAGE 63640 60949 59494 58737 58386 58000 57322 56879 56807 SYSTEM POWER AVE POWER MW 2166 1611 1638 1662 1734 1170 1223 1193 PEAK POW MW 2353 2344 2315 2303 2296 2296 2314 2320 ENERGY GWH 6570.6 1559.9 1198.4 589.7 279.3 332.9 870.1 909.8 830.5 DAILY GWH 52.0 38.7 39.3 39.9 41.6 28.1 29.3 28.6 INI-SUM 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB

DATE OF STUDY 11/30/11 SEP 1, 2011 / LOWER BASIC / 59.9 MAF / BALANCED 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 NAV SEASON 10-DAY EXTENSION STUDY NO 3 VALUES IN 1000 AF EXCEPT AS INDICATED 31AUG11 2011 2012 INI-SUM 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB --FORT PECK-- NAT INFLOW 1788 360 320 154 72 82 263 250 288 DEPLETION -847 -195 -155 -60 -28 -32 -120 -138 -119 EVAPORATION 439 144 122 55 26 29 63 MOD INFLOW 2196 411 353 158 74 85 320 388 407 RELEASE 3948 1298 492 238 111 127 492 615 575 STOR CHANGE -1752 -887 -139 -80 -37 -42 -172 -227 -168 STORAGE 16537 15650 15511 15431 15394 15352 15180 14953 14785 ELEV FTMSL 2241.9 2238.0 2237.4 2237.0 2236.8 2236.6 2235.8 2234.8 2234.0 DISCH KCFS 24.5 21.8 8.0 8.0 8.0 8.0 8.0 10.0 10.0 POWER AVE POWER MW 166 110 110 110 110 110 136 136 PEAK POW MW 164 165 164 164 164 164 163 162 ENERGY GWH 558.5 119.3 82.0 39.6 18.5 21.1 81.7 101.5 94.7 --GARRISON-- NAT INFLOW 2010 560 440 159 74 85 198 209 285 DEPLETION -752 -202 -54 -117 -55 -62 -115 -84 -63 CHAN STOR 140 26 134 -20 EVAPORATION 509 166 143 64 30 34 73 REG INFLOW 6341 1920 977 450 210 240 732 888 923 RELEASE 8582 2437 1230 595 278 317 1107 1353 1265 STOR CHANGE -2241 -517 -253 -145 -68 -77 -375 -464 -342 STORAGE 20348 19831 19578 19433 19365 19288 18914 18449 18107 ELEV FTMSL 1844.4 1842.9 1842.1 1841.7 1841.4 1841.2 1840.1 1838.6 1837.5 DISCH KCFS 74.0 41.0 20.0 20.0 20.0 20.0 18.0 22.0 22.0 POWER AVE POWER MW 499 255 254 253 253 228 276 274 PEAK POW MW 497 487 483 482 481 477 472 468 ENERGY GWH 1296.2 358.9 189.5 91.4 42.6 48.6 169.3 205.3 190.6 --OAHE-- NAT INFLOW 298 104 56 28 13 15 10 72 DEPLETION 92 28 -9 2 1 1 15 21 33 CHAN STOR 196 123 81 0 8 -16 EVAPORATION 501 164 140 63 30 34 72 REG INFLOW 8483 2472 1237 558 260 298 1028 1326 1304 RELEASE 10396 3779 1058 584 305 457 1388 1480 1344 STOR CHANGE -1913 -1307 178 -26 -45 -159 -360 -154 -40 STORAGE 20744 19437 19615 19589 19544 19385 19025 18871 18831 ELEV FTMSL 1613.3 1609.4 1610.0 1609.9 1609.7 1609.2 1608.1 1607.6 1607.5 DISCH KCFS 80.0 63.5 17.2 19.6 22.0 28.8 22.6 24.1 23.4 POWER AVE POWER MW 727 225 257 287 375 293 311 302 PEAK POW MW 717 721 720 720 717 711 708 708 ENERGY GWH 1563.0 523.3 167.5 92.4 48.3 71.9 218.1 231.5 210.0 --BIG BEND-- EVAPORATION 96 31 27 12 6 7 14 REG INFLOW 10300 3749 1031 572 300 450 1374 1480 1344 RELEASE 10259 3708 1031 572 300 450 1374 1480 1344 STORAGE 1580 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1419.3 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 80.0 62.3 16.8 19.2 21.6 28.4 22.3 24.1 23.4 POWER AVE POWER MW 290 82 97 108 142 112 118 112 PEAK POW MW 511 538 538 538 538 538 538 529 ENERGY GWH 599.4 208.8 61.3 34.8 18.2 27.2 83.3 87.8 78.0 --FORT RANDALL-- NAT INFLOW 209 112 14 7 3 4 10 20 39 DEPLETION 19 7 1 1 0 1 3 3 3 EVAPORATION 107 41 31 12 5 5 12 REG INFLOW 10342 3772 1013 566 298 447 1369 1497 1380 RELEASE 11300 4314 1787 888 414 473 1271 1147 1006 STOR CHANGE -958 -543 -774 -322 -116 -26 99 350 374 STORAGE 4074 3531 2757 2436 2319 2294 2392 2742 3116 ELEV FTMSL 1361.1 1355.0 1344.9 1339.9 1337.9 1337.4 1339.2 1344.7 1349.9 DISCH KCFS 87.0 72.5 29.1 29.8 29.8 29.8 20.7 18.7 17.5 POWER AVE POWER MW 362 234 225 218 215 151 141 139 PEAK POW MW 351 319 296 287 285 293 318 339 ENERGY GWH 907.8 260.3 174.3 81.1 36.6 41.3 112.4 105.0 96.7 --GAVINS POINT-- NAT INFLOW 592 120 112 48 22 26 80 80 104 DEPLETION 18 -5 2 5 2 3 10 1 CHAN STOR 129 27 80 -1 0 0 17 4 2 EVAPORATION 34 11 10 4 2 2 5 REG INFLOW 11969 4456 1968 925 432 493 1353 1230 1112 RELEASE 11984 4433 1968 925 432 493 1353 1230 1150 STOR CHANGE -15 23 -38 STORAGE 357 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.6 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 90.0 74.5 32.0 31.1 31.1 31.1 22.0 20.0 20.0 POWER AVE POWER MW 110 108 106 106 106 77 71 70 PEAK POW MW 112 117 117 117 117 117 117 114 ENERGY GWH 395.3 79.4 80.6 38.3 17.9 20.4 57.6 52.5 48.7 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 946 320 240 80 37 43 120 32 74 DEPLETION 88 24 11 6 3 3 13 14 14 REGULATED FLOW AT SIOUX CITY KAF 12842 4729 2197 999 466 533 1460 1248 1210 KCFS 79.5 35.7 33.6 33.6 33.6 23.7 20.3 21.0 --TOTAL-- NAT INFLOW 5843 1576 1182 476 222 254 671 601 862 DEPLETION -1382 -343 -204 -163 -76 -87 -194 -183 -132 CHAN STOR 466 176 296 -1 0 -1 25 -32 2 EVAPORATION 1687 556 473 211 98 111 239 STORAGE 63640 60450 59462 58890 58624 58320 57512 57016 56802 SYSTEM POWER AVE POWER MW 2153 1015 1049 1083 1201 971 1053 1033 PEAK POW MW 2351 2346 2319 2308 2302 2300 2317 2320 ENERGY GWH 5320.1 1550.1 755.3 377.6 182.0 230.6 722.5 783.6 718.6 DAILY GWH 51.7 24.4 25.2 26.0 28.8 23.3 25.3 24.8 INI-SUM 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB

DATE OF STUDY 11/30/11 2011-2012 AOP UPPER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:51:07 STUDY NO 4 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB12 2012 2013 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 9500 315 147 189 790 1590 2465 1205 450 375 525 208 97 111 345 295 395 DEPLETION 385 -43 -20 -26 -108 313 668 231 -40 -128 -73 -24 -11 -13 -118 -140 -84 EVAPORATION 333 23 71 88 76 18 8 10 39 MOD INFLOW 8782 357 167 214 898 1277 1797 951 419 415 522 213 100 114 424 435 479 RELEASE 8774 193 90 116 476 676 893 922 922 740 615 298 139 167 830 892 805 STOR CHANGE 8 164 76 98 422 601 904 29 -503 -325 -93 -84 -39 -53 -406 -457 -326 STORAGE 14787 14950 15027 15125 15547 16148 17052 17081 16578 16253 16160 16076 16037 15984 15578 15121 14795 ELEV FTMSL 2234.0 2234.8 2235.1 2235.6 2237.5 2240.2 2244.1 2244.3 2242.1 2240.7 2240.3 2239.9 2239.7 2239.5 2237.7 2235.6 2234.0 DISCH KCFS 13.0 6.5 6.5 6.5 8.0 11.0 15.0 15.0 15.0 12.4 10.0 10.0 10.0 10.5 13.5 14.5 14.5 POWER AVE POWER MW 89 89 89 110 150 168 169 169 168 139 138 138 145 165 164 163 PEAK POW MW 163 163 163 165 167 169 169 168 167 167 167 166 166 165 163 162 ENERGY GWH 1308.6 32.0 14.9 19.2 79.1 111.8 120.9 126.1 125.5 120.7 103.1 49.9 23.2 27.8 123.1 122.0 109.3 --GARRISON-- NAT INFLOW 14000 528 246 316 1355 1840 3425 2715 835 570 645 258 120 137 270 325 415 DEPLETION 999 11 5 7 -73 -27 977 633 100 -126 10 -119 -56 -63 -119 -101 -60 CHAN STOR -15 64 -15 -29 -39 25 23 -5 -29 -10 EVAPORATION 377 26 82 101 86 20 9 11 43 REG INFLOW 21384 774 331 426 1889 2514 3302 2979 1576 1360 1188 654 305 352 1147 1308 1280 RELEASE 21375 536 250 321 1428 1968 2142 2214 2214 1994 1906 922 430 421 1353 1722 1555 STOR CHANGE 8 239 81 104 461 546 1160 765 -638 -635 -719 -268 -125 -68 -206 -414 -275 STORAGE 18109 18347 18429 18533 18994 19540 20700 21465 20827 20192 19474 19206 19080 19012 18806 18392 18117 ELEV FTMSL 1837.5 1838.3 1838.5 1838.9 1840.3 1842.0 1845.4 1847.6 1845.8 1843.9 1841.8 1841.0 1840.6 1840.4 1839.7 1838.4 1837.5 DISCH KCFS 26.0 18.0 18.0 18.0 24.0 32.0 36.0 36.0 36.0 33.5 31.0 31.0 31.0 26.5 22.0 28.0 28.0 POWER AVE POWER MW 224 225 225 301 404 451 459 460 428 394 392 391 334 277 350 347 PEAK POW MW 471 472 473 479 487 500 502 500 499 483 481 479 479 476 471 468 ENERGY GWH 3264.4 80.7 37.8 48.7 216.9 300.5 325.0 341.5 341.9 307.9 292.8 141.0 65.6 64.1 206.2 260.2 233.4 --OAHE-- NAT INFLOW 3800 358 167 215 545 360 1265 215 110 150 95 108 50 57 -45 25 125 DEPLETION 696 24 11 15 50 72 148 178 119 29 -11 1 0 1 13 18 28 CHAN STOR -6 32 -23 -30 -15 9 10 18 18 -24 EVAPORATION 362 26 79 96 82 19 9 10 41 REG INFLOW 24111 901 406 522 1900 2225 3244 2225 2126 2029 1940 1010 471 485 1272 1704 1652 RELEASE 24103 617 288 330 1150 1749 2352 2913 2943 2751 2350 1122 557 744 1548 1469 1221 STOR CHANGE 8 285 118 191 750 477 892 -688 -817 -722 -410 -112 -86 -258 -277 235 431 STORAGE 18833 19117 19235 19426 20177 20653 21545 20857 20040 19318 18908 18796 18710 18452 18175 18410 18841 ELEV FTMSL 1607.5 1608.4 1608.8 1609.4 1611.7 1613.1 1615.6 1613.7 1611.2 1609.0 1607.7 1607.4 1607.1 1606.3 1605.4 1606.1 1607.5 DISCH KCFS 26.1 20.7 20.7 18.5 19.3 28.4 39.5 47.4 47.9 46.2 38.2 37.7 40.1 46.9 25.2 23.9 22.0 POWER AVE POWER MW 268 269 241 254 376 525 628 626 600 493 484 514 596 322 305 283 PEAK POW MW 713 715 718 730 737 750 740 728 716 709 707 706 701 696 701 708 ENERGY GWH 3797.6 96.6 45.2 52.1 182.5 279.4 378.3 466.9 465.6 432.2 366.9 174.4 86.3 114.4 239.4 227.1 190.1 --BIG BEND-- EVAPORATION 71 5 15 19 16 4 2 2 9 REG INFLOW 24032 617 288 330 1150 1749 2352 2908 2928 2732 2334 1118 555 742 1540 1469 1221 RELEASE 24032 617 288 330 1150 1749 2352 2908 2928 2732 2334 1118 555 742 1540 1469 1221 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 26.1 20.7 20.7 18.5 19.3 28.4 39.5 47.3 47.6 45.9 38.0 37.6 40.0 46.7 25.0 23.9 22.0 POWER AVE POWER MW 98 97 87 90 133 185 221 223 217 185 186 198 231 125 117 105 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 1387.2 35.3 16.3 18.7 65.1 99.0 133.2 164.5 165.6 156.3 137.3 67.1 33.3 44.3 93.2 87.1 70.8 --FORT RANDALL-- NAT INFLOW 1500 148 69 89 425 220 150 90 85 80 30 20 9 11 15 60 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 81 6 19 24 18 4 2 2 7 REG INFLOW 25373 763 356 418 1571 1960 2490 2974 2979 2782 2345 1133 562 749 1547 1466 1278 RELEASE 25365 464 222 418 1571 1960 2490 2974 2979 2928 2988 1454 678 775 1444 1116 904 STOR CHANGE 8 299 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3116 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1349.9 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 20.6 15.6 16.0 23.4 26.4 31.9 41.9 48.4 48.4 49.2 48.6 48.9 48.9 48.9 23.5 18.1 16.3 POWER AVE POWER MW 129 135 198 223 268 336 356 356 353 336 307 291 286 172 138 130 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 284 294 319 339 ENERGY GWH 2278.7 46.4 22.7 42.8 160.3 199.4 241.8 264.9 264.9 254.2 250.1 110.7 48.9 54.8 127.6 102.3 87.0 --GAVINS POINT-- NAT INFLOW 2300 121 56 73 225 345 290 215 185 135 155 70 33 37 90 105 165 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 6 10 -1 -14 -6 -10 -19 -12 0 -1 1 -1 0 0 47 10 3 EVAPORATION 24 2 5 6 6 1 1 1 3 REG INFLOW 27533 595 278 477 1785 2275 2737 3136 3149 3060 3136 1517 708 809 1568 1230 1073 RELEASE 27533 595 278 477 1785 2275 2737 3136 3136 3035 3136 1517 708 809 1568 1230 1111 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 24.0 20.0 20.0 26.7 30.0 37.0 46.0 51.0 51.0 51.0 51.0 51.0 51.0 51.0 25.5 20.0 20.0 POWER AVE POWER MW 69 69 91 101 114 113 112 113 115 115 115 115 115 79 70 69 PEAK POW MW 114 114 114 114 114 113 112 113 115 115 115 115 115 78 78 76 ENERGY GWH 870.2 24.8 11.6 19.7 72.6 85.0 81.1 83.1 83.7 82.5 85.8 41.5 19.4 22.1 58.6 52.0 46.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 3200 165 77 99 515 915 395 265 210 155 80 48 22 25 60 35 135 DEPLETION 268 7 3 4 22 36 31 39 37 24 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 30465 753 351 571 2278 3154 3101 3362 3309 3166 3205 1559 727 831 1615 1251 1231 KCFS 25.3 25.3 32.0 38.3 51.3 52.1 54.7 53.8 53.2 52.1 52.4 52.4 52.4 26.3 20.3 22.2 --TOTAL-- NAT INFLOW 34300 1633 762 980 3855 5270 7990 4705 1875 1465 1530 710 331 379 735 785 1295 DEPLETION 2542 0 0 0 -100 422 1860 1138 241 -199 -60 -130 -61 -69 -198 -205 -98 CHAN STOR -13 106 -1 -14 -44 -70 -73 -12 0 33 34 -1 0 12 38 -24 3 EVAPORATION 1248 86 270 334 284 66 31 35 142 STORAGE 56807 57793 58203 58596 60230 61853 64809 64916 62970 61168 59303 58517 58151 57745 56960 56674 56840 SYSTEM POWER AVE POWER MW 877 884 931 1079 1445 1778 1945 1945 1880 1661 1624 1648 1706 1140 1143 1097 PEAK POW MW 2328 2329 2334 2353 2370 2397 2388 2374 2365 2331 2304 2292 2284 2247 2270 2282 ENERGY GWH 12906.6 315.8 148.5 201.2 776.6 1075.1 1280.3 1446.9 1447.3 1353.8 1236.1 584.5 276.8 327.5 848.2 850.7 737.2 DAILY GWH 21.1 21.2 22.4 25.9 34.7 42.7 46.7 46.7 45.1 39.9 39.0 39.5 40.9 27.4 27.4 26.3 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP UPPER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:48:14 STUDY NO 5 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB12 2012 2013 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 8650 288 134 173 715 1445 2245 1100 410 340 480 188 88 100 315 270 360 DEPLETION 382 -43 -20 -26 -108 312 669 231 -55 -118 -80 -25 -12 -13 -113 -135 -83 EVAPORATION 328 22 70 86 75 18 8 9 39 MOD INFLOW 7940 331 154 198 823 1133 1576 847 395 372 485 195 91 104 389 405 443 RELEASE 7945 193 90 116 476 676 803 830 830 641 492 238 111 127 799 799 722 STOR CHANGE -5 137 64 82 347 457 773 17 -435 -269 -7 -43 -20 -23 -410 -394 -279 STORAGE 14787 14924 14988 15070 15417 15874 16646 16663 16228 15959 15952 15909 15888 15865 15455 15061 14782 ELEV FTMSL 2234.0 2234.6 2234.9 2235.3 2236.9 2239.0 2242.4 2242.5 2240.6 2239.4 2239.4 2239.2 2239.1 2239.0 2237.1 2235.3 2234.0 DISCH KCFS 13.0 6.5 6.5 6.5 8.0 11.0 13.5 13.5 13.5 10.8 8.0 8.0 8.0 8.0 13.0 13.0 13.0 POWER AVE POWER MW 89 89 89 110 150 167 168 168 148 111 111 111 111 165 164 163 PEAK POW MW 163 163 163 164 166 168 168 167 166 166 166 166 166 164 163 162 ENERGY GWH 1249.4 32.0 14.9 19.2 79.0 111.4 120.3 125.2 124.7 106.6 82.4 39.9 18.6 21.3 122.8 121.8 109.3 --GARRISON-- NAT INFLOW 12800 484 226 290 1240 1685 3130 2480 760 520 590 235 110 125 245 300 380 DEPLETION 998 11 5 7 -73 9 916 659 93 -129 -1 -120 -56 -64 -114 -93 -53 CHAN STOR 0 64 -15 -29 -24 26 27 -49 EVAPORATION 375 25 81 100 86 20 9 11 43 REG INFLOW 19372 731 311 400 1774 2323 2993 2626 1416 1216 1024 573 267 305 1066 1192 1155 RELEASE 19377 476 222 286 1398 1968 1904 1906 1906 1725 1660 803 375 413 1291 1599 1444 STOR CHANGE -5 255 89 114 376 355 1089 720 -490 -510 -636 -231 -108 -107 -225 -406 -289 STORAGE 18109 18363 18452 18566 18942 19297 20386 21106 20616 20106 19470 19239 19131 19024 18799 18393 18104 ELEV FTMSL 1837.5 1838.3 1838.6 1839.0 1840.1 1841.2 1844.5 1846.6 1845.2 1843.7 1841.8 1841.1 1840.7 1840.4 1839.7 1838.4 1837.5 DISCH KCFS 26.0 16.0 16.0 16.0 23.5 32.0 32.0 31.0 31.0 29.0 27.0 27.0 27.0 26.0 21.0 26.0 26.0 POWER AVE POWER MW 200 200 201 295 403 406 399 400 372 343 341 341 328 265 325 323 PEAK POW MW 471 472 474 478 482 499 501 500 499 483 481 480 479 476 471 468 ENERGY GWH 2969.6 71.9 33.6 43.4 212.3 299.7 292.4 297.0 297.5 267.5 255.3 122.9 57.3 63.0 197.0 241.8 216.9 --OAHE-- NAT INFLOW 3100 302 141 181 520 305 1010 185 95 125 65 55 26 29 -65 10 115 DEPLETION 696 24 11 15 50 72 148 178 119 29 -11 1 0 1 13 18 28 CHAN STOR 1 40 -29 -33 4 8 8 4 20 -20 EVAPORATION 364 26 79 96 82 19 9 10 42 REG INFLOW 21417 794 352 453 1839 2168 2766 1891 1803 1733 1662 838 391 435 1191 1571 1531 RELEASE 21422 646 301 348 1127 1314 2091 2529 2542 2359 1950 923 464 638 1445 1488 1257 STOR CHANGE -5 148 51 105 712 854 675 -637 -738 -626 -288 -86 -73 -203 -254 83 274 STORAGE 18833 18980 19031 19136 19847 20702 21377 20739 20001 19375 19086 19001 18927 18725 18471 18554 18828 ELEV FTMSL 1607.5 1608.0 1608.1 1608.5 1610.7 1613.2 1615.1 1613.3 1611.1 1609.2 1608.3 1608.0 1607.8 1607.1 1606.3 1606.6 1607.5 DISCH KCFS 26.1 21.7 21.7 19.5 18.9 21.4 35.1 41.1 41.3 39.6 31.7 31.0 33.4 40.2 23.5 24.2 22.6 POWER AVE POWER MW 281 281 253 247 282 467 546 543 516 411 401 431 516 302 310 291 PEAK POW MW 710 711 713 725 738 748 738 727 717 712 711 709 706 702 703 708 ENERGY GWH 3382.3 101.1 47.2 54.6 178.2 209.9 336.5 406.2 404.2 371.5 305.6 144.3 72.4 99.0 224.8 230.9 195.8 --BIG BEND-- EVAPORATION 71 5 15 19 16 4 2 2 9 REG INFLOW 21352 646 301 348 1127 1314 2091 2524 2527 2340 1934 920 463 636 1437 1488 1257 RELEASE 21352 646 301 348 1127 1314 2091 2524 2527 2340 1934 920 463 636 1437 1488 1257 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 26.1 21.7 21.7 19.5 18.9 21.4 35.1 41.0 41.1 39.3 31.4 30.9 33.3 40.1 23.4 24.2 22.6 POWER AVE POWER MW 103 102 91 89 100 164 192 192 186 153 154 166 198 117 119 108 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 1234.1 37.1 17.1 19.7 63.9 74.4 118.4 142.8 143.0 134.1 114.1 55.4 27.8 38.1 87.1 88.2 72.9 --FORT RANDALL-- NAT INFLOW 1200 131 61 78 285 180 140 80 75 70 15 15 7 8 10 -5 50 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 81 6 19 24 18 4 2 2 7 REG INFLOW 22392 776 362 425 1408 1485 2219 2580 2568 2380 1929 930 468 641 1438 1480 1304 RELEASE 22384 477 228 425 1408 1485 2219 2580 2568 2526 2572 1251 584 667 1335 1130 930 STOR CHANGE 8 299 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3116 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1349.9 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 20.6 16.0 16.4 23.8 23.7 24.1 37.3 42.0 41.8 42.4 41.8 42.0 42.0 42.0 21.7 18.4 16.7 POWER AVE POWER MW 132 138 201 200 204 313 336 335 336 318 296 284 279 159 139 133 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 294 319 339 ENERGY GWH 2132.6 47.6 23.2 43.5 144.0 151.7 225.2 250.2 249.6 241.7 236.8 106.7 47.7 53.6 118.1 103.6 89.5 --GAVINS POINT-- NAT INFLOW 2000 109 51 65 185 300 240 175 165 120 140 65 30 35 85 95 140 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 6 9 -1 -14 0 -1 -25 -9 0 -1 1 0 0 0 38 6 3 EVAPORATION 24 2 5 6 6 1 1 1 3 REG INFLOW 24251 595 278 477 1589 1765 2410 2705 2718 2643 2705 1309 611 698 1445 1230 1073 RELEASE 24251 595 278 477 1589 1765 2410 2705 2705 2618 2705 1309 611 698 1445 1230 1111 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 24.0 20.0 20.0 26.7 26.7 28.7 40.5 44.0 44.0 44.0 44.0 44.0 44.0 44.0 23.5 20.0 20.0 POWER AVE POWER MW 69 69 91 91 98 114 113 114 115 116 116 116 116 78 70 69 PEAK POW MW 114 114 114 114 114 114 113 114 116 116 116 116 116 78 78 76 ENERGY GWH 854.9 24.8 11.6 19.7 65.6 72.6 81.9 84.1 84.8 82.9 86.3 41.8 19.5 22.3 58.4 52.0 46.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 2550 145 68 87 410 705 315 215 155 125 65 38 18 20 50 30 105 DEPLETION 268 7 3 4 22 36 31 39 37 24 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 26533 733 342 560 1977 2434 2694 2881 2823 2719 2759 1341 626 715 1482 1246 1201 KCFS 24.7 24.7 31.4 33.2 39.6 45.3 46.9 45.9 45.7 44.9 45.1 45.1 45.1 24.1 20.3 21.6 --TOTAL-- NAT INFLOW 30300 1459 681 875 3355 4620 7080 4235 1660 1300 1355 595 278 317 640 700 1150 DEPLETION 2538 0 0 0 -100 457 1800 1164 219 -192 -78 -132 -61 -70 -188 -192 -90 CHAN STOR 7 113 -1 -14 -44 -63 -50 -5 0 33 36 -1 0 3 10 -14 3 EVAPORATION 1242 85 268 331 284 66 31 35 142 STORAGE 56807 57645 57983 58283 59718 61384 63921 64020 62370 60844 59269 58588 58271 57912 57126 56758 56801 SYSTEM POWER AVE POWER MW 874 879 926 1032 1236 1631 1755 1752 1673 1452 1419 1448 1548 1086 1127 1088 PEAK POW MW 2326 2326 2329 2346 2365 2394 2386 2373 2366 2335 2308 2297 2290 2252 2272 2282 ENERGY GWH 11822.9 314.5 147.7 200.1 742.9 919.8 1174.6 1305.6 1303.8 1204.2 1080.6 511.0 243.3 297.2 808.2 838.3 730.9 DAILY GWH 21.0 21.1 22.2 24.8 29.7 39.2 42.1 42.1 40.1 34.9 34.1 34.8 37.2 26.1 27.0 26.1 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP MEDIAN RUNOFF 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 STUDY NO 6 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB12 2012 2013 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 7200 230 107 138 600 1180 1810 840 315 295 430 180 84 96 300 250 345 DEPLETION 419 -44 -20 -26 23 308 526 248 8 -69 -48 -43 -20 -23 -136 -157 -109 EVAPORATION 462 29 89 111 96 44 20 23 50 MOD INFLOW 6319 273 128 164 577 872 1284 563 218 253 382 179 83 95 386 407 454 RELEASE 6487 179 83 107 476 646 625 646 646 487 369 179 83 119 615 646 583 STOR CHANGE -168 95 44 57 101 226 659 -82 -428 -234 13 0 0 -24 -229 -239 -129 STORAGE 14793 14888 14932 14989 15090 15316 15975 15893 15466 15232 15245 15245 15245 15222 14993 14754 14625 ELEV FTMSL 2234.0 2234.5 2234.7 2234.9 2235.4 2236.5 2239.5 2239.1 2237.2 2236.1 2236.1 2236.1 2236.1 2236.0 2235.0 2233.8 2233.2 DISCH KCFS 12.0 6.0 6.0 6.0 8.0 10.5 10.5 10.5 10.5 8.2 6.0 6.0 6.0 7.5 10.0 10.5 10.5 POWER AVE POWER MW 82 82 82 109 143 144 144 144 112 82 82 82 103 137 142 142 PEAK POW MW 163 163 163 163 164 166 166 165 164 164 164 164 164 163 162 162 ENERGY GWH 1071.8 29.5 13.8 17.7 78.8 106.2 103.5 107.4 107.0 80.9 61.3 29.7 13.8 19.8 101.6 105.6 95.1 --GARRISON-- NAT INFLOW 10800 460 214 276 870 1325 3095 1860 595 460 495 195 91 104 180 260 320 DEPLETION 1006 6 3 3 -17 112 860 602 97 -127 -28 -125 -58 -66 -117 -88 -51 CHAN STOR 15 60 -20 -25 22 21 -15 -24 -5 EVAPORATION 538 33 104 130 112 51 24 27 58 REG INFLOW 15758 692 295 379 1343 1834 2860 1871 1039 967 801 447 209 248 830 989 954 RELEASE 15965 476 222 286 1190 1599 1607 1599 1599 1235 984 476 222 254 1291 1537 1388 STOR CHANGE -207 216 73 94 153 235 1253 272 -559 -268 -183 -29 -13 -6 -462 -548 -434 STORAGE 18115 18331 18404 18497 18651 18886 20139 20411 19852 19583 19400 19372 19358 19352 18891 18342 17908 ELEV FTMSL 1837.5 1838.2 1838.4 1838.7 1839.2 1840.0 1843.8 1844.6 1842.9 1842.1 1841.6 1841.5 1841.4 1841.4 1840.0 1838.3 1836.8 DISCH KCFS 24.0 16.0 16.0 16.0 20.0 26.0 27.0 26.0 26.0 20.8 16.0 16.0 16.0 16.0 21.0 25.0 25.0 POWER AVE POWER MW 200 200 200 251 326 342 333 332 264 203 203 203 203 265 313 310 PEAK POW MW 471 472 473 475 477 499 499 498 487 483 482 482 482 477 471 466 ENERGY GWH 2439.2 71.8 33.6 43.3 180.4 242.6 246.0 247.9 247.3 190.3 151.4 73.1 34.1 39.0 197.5 232.7 208.2 --OAHE-- NAT INFLOW 2300 232 108 139 405 195 780 160 75 95 35 30 14 16 -80 95 DEPLETION 696 24 11 15 50 72 148 178 119 29 -11 1 0 1 13 18 28 CHAN STOR -5 32 -16 -24 -4 4 21 19 -20 -16 EVAPORATION 507 32 100 123 105 47 22 25 54 REG INFLOW 17057 716 319 410 1529 1698 2235 1552 1455 1199 944 458 214 245 1124 1503 1455 RELEASE 17270 680 309 358 1298 1497 1611 1849 1979 1759 1259 562 296 272 1096 1324 1120 STOR CHANGE -213 36 11 52 231 201 623 -297 -524 -560 -315 -104 -82 -28 28 179 335 STORAGE 18839 18875 18885 18938 19169 19370 19993 19696 19172 18613 18297 18194 18111 18084 18112 18291 18626 ELEV FTMSL 1607.5 1607.6 1607.7 1607.8 1608.6 1609.2 1611.1 1610.2 1608.6 1606.8 1605.8 1605.4 1605.1 1605.0 1605.1 1605.7 1606.8 DISCH KCFS 22.7 22.9 22.2 20.1 21.8 24.3 27.1 30.1 32.2 29.6 20.5 18.9 21.3 17.1 17.8 21.5 20.2 POWER AVE POWER MW 295 287 260 283 316 354 394 418 381 263 242 272 219 227 275 259 PEAK POW MW 708 709 710 713 717 727 722 714 704 699 697 695 695 695 698 704 ENERGY GWH 2700.6 106.3 48.2 56.1 203.6 235.3 254.8 292.8 311.1 274.4 195.5 87.0 45.7 42.0 169.2 204.6 174.0 --BIG BEND-- EVAPORATION 103 6 20 25 22 10 5 5 11 REG INFLOW 17167 680 309 358 1298 1497 1611 1843 1959 1734 1238 552 292 267 1085 1324 1120 RELEASE 17167 680 309 358 1298 1497 1611 1843 1959 1734 1238 552 292 267 1085 1324 1120 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 22.7 22.9 22.2 20.1 21.8 24.3 27.1 30.0 31.9 29.1 20.1 18.6 21.0 16.8 17.6 21.5 20.2 POWER AVE POWER MW 108 104 94 102 114 127 140 149 138 99 93 105 85 89 106 97 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 991.7 39.0 17.5 20.3 73.5 84.8 91.3 104.4 110.9 99.4 73.5 33.6 17.7 16.3 66.0 78.6 65.0 --FORT RANDALL-- NAT INFLOW 900 119 55 71 155 140 135 70 65 30 10 5 5 5 -10 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 117 8 25 31 25 9 4 4 10 REG INFLOW 17870 797 363 428 1449 1628 1734 1887 1984 1726 1212 551 292 268 1077 1311 1162 RELEASE 17854 489 229 428 1449 1628 1734 1887 1984 1872 1855 872 408 294 974 961 788 STOR CHANGE 16 308 134 0 0 -146 -643 -321 -116 -26 102 350 374 STORAGE 3107 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2399 2749 3123 ELEV FTMSL 1349.8 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 17.0 16.4 16.5 24.0 24.4 26.5 29.1 30.7 32.3 31.5 30.2 29.3 29.4 18.5 15.8 15.6 14.2 POWER AVE POWER MW 136 139 203 206 223 246 258 271 263 242 221 215 135 116 119 113 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1762.4 48.8 23.4 43.8 148.1 166.1 176.8 192.1 201.8 189.2 179.7 79.7 36.1 25.9 86.6 88.3 76.0 --GAVINS POINT-- NAT INFLOW 1500 104 49 62 145 160 175 100 90 95 120 60 28 32 80 85 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 4 1 0 -14 -1 -4 -5 -3 -3 2 2 2 0 20 5 0 3 EVAPORATION 36 2 6 9 8 3 2 2 4 REG INFLOW 19208 595 278 477 1589 1765 1880 1943 2054 1965 1968 925 432 341 1045 1045 906 RELEASE 19208 595 278 477 1589 1765 1880 1943 2041 1940 1968 925 432 341 1045 1045 944 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 20.0 20.0 20.0 26.7 26.7 28.7 31.6 31.6 33.2 32.6 32.0 31.1 31.1 21.5 17.0 17.0 17.0 POWER AVE POWER MW 69 69 91 91 98 105 105 109 109 108 106 106 76 60 60 60 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 787.5 24.8 11.6 19.7 65.6 72.6 75.3 77.8 80.9 78.3 80.6 38.3 17.9 14.5 44.7 44.7 40.1 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 138 64 83 325 295 150 180 120 105 55 30 14 16 25 25 75 DEPLETION 268 7 3 4 22 36 31 39 37 24 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 20640 726 339 555 1892 2024 1999 2084 2124 2021 2012 949 443 354 1057 1056 1004 KCFS 24.4 24.4 31.1 31.8 32.9 33.6 33.9 34.5 34.0 32.7 31.9 31.9 22.3 17.2 17.2 18.1 --TOTAL-- NAT INFLOW 24400 1283 598 769 2500 3295 6145 3210 1260 1080 1135 505 236 269 510 610 995 DEPLETION 2583 -6 -3 -3 87 556 1601 1124 286 -141 -73 -154 -72 -82 -214 -209 -114 CHAN STOR 14 92 0 -14 -36 -52 -9 1 -3 44 43 1 0 6 -40 -21 3 EVAPORATION 1763 110 345 428 368 164 76 86 187 STORAGE 56817 57471 57733 57936 58421 59084 61620 61513 60015 58832 57703 57250 57039 56956 56396 56137 56245 SYSTEM POWER AVE POWER MW 890 882 930 1042 1220 1316 1374 1423 1267 997 948 984 820 895 1014 980 PEAK POW MW 2324 2323 2325 2331 2338 2371 2367 2357 2339 2319 2294 2284 2281 2245 2266 2275 ENERGY GWH 9753.2 320.3 148.1 200.8 750.0 907.7 947.6 1022.4 1059.1 912.6 742.0 341.3 165.4 157.4 665.7 754.5 658.4 DAILY GWH 21.4 21.2 22.3 25.0 29.3 31.6 33.0 34.2 30.4 23.9 22.8 23.6 19.7 21.5 24.3 23.5 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 STUDY NO 7 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB12 2012 2013 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 6000 203 95 122 485 955 1480 665 285 255 340 165 77 88 260 220 305 DEPLETION 319 -45 -21 -27 55 194 385 188 43 -65 -44 -32 -15 -17 -102 -105 -73 EVAPORATION 553 35 108 133 115 52 24 28 59 MOD INFLOW 5128 248 116 149 430 761 1095 442 134 187 269 145 68 78 303 325 378 RELEASE 6741 179 83 107 417 646 655 676 676 508 369 179 83 111 707 707 639 STOR CHANGE -1613 70 33 42 13 115 440 -234 -542 -321 -100 -33 -16 -34 -404 -382 -261 STORAGE 14785 14855 14887 14929 14942 15058 15498 15264 14722 14401 14301 14268 14252 14219 13815 13433 13172 ELEV FTMSL 2234.0 2234.3 2234.5 2234.7 2234.7 2235.3 2237.3 2236.2 2233.7 2232.1 2231.7 2231.5 2231.4 2231.2 2229.2 2227.3 2226.0 DISCH KCFS 10.0 6.0 6.0 6.0 7.0 10.5 11.0 11.0 11.0 8.5 6.0 6.0 6.0 7.0 11.5 11.5 11.5 POWER AVE POWER MW 82 82 82 96 142 149 149 148 116 81 81 81 95 151 149 148 PEAK POW MW 162 163 163 163 163 165 164 162 161 160 160 160 160 159 157 156 ENERGY GWH 1092.1 29.5 13.8 17.7 68.9 105.9 107.2 110.9 110.2 83.5 60.5 29.3 13.6 18.2 112.1 111.2 99.7 --GARRISON-- NAT INFLOW 9200 423 198 254 705 1110 2635 1585 505 390 420 165 77 88 150 220 275 DEPLETION 1060 2 1 1 21 134 710 531 161 -89 10 -115 -53 -61 -93 -62 -38 CHAN STOR -15 40 -10 -35 -5 24 25 -10 -45 EVAPORATION 623 39 122 150 129 58 27 31 66 REG INFLOW 14243 640 280 360 1091 1587 2575 1691 898 861 675 400 187 219 839 989 952 RELEASE 16220 476 222 286 1547 1783 1696 1476 1476 1191 984 476 222 286 1291 1476 1333 STOR CHANGE -1977 164 58 74 -456 -196 879 216 -577 -330 -309 -76 -35 -66 -452 -487 -381 STORAGE 18107 18271 18328 18403 17946 17750 18628 18844 18267 17937 17628 17552 17516 17450 16998 16511 16130 ELEV FTMSL 1837.5 1838.0 1838.2 1838.4 1837.0 1836.3 1839.2 1839.8 1838.0 1836.9 1835.9 1835.7 1835.5 1835.3 1833.8 1832.1 1830.8 DISCH KCFS 22.0 16.0 16.0 16.0 26.0 29.0 28.5 24.0 24.0 20.0 16.0 16.0 16.0 18.0 21.0 24.0 24.0 POWER AVE POWER MW 199 200 200 322 357 353 301 300 249 198 197 197 221 256 289 286 PEAK POW MW 470 471 472 466 464 474 477 470 466 462 461 461 460 454 448 443 ENERGY GWH 2417.6 71.8 33.6 43.2 232.1 265.3 254.1 224.0 223.3 178.9 147.2 70.9 33.1 42.4 190.4 215.0 192.3 --OAHE-- NAT INFLOW 1300 203 95 122 180 130 275 140 65 75 15 13 6 7 -90 -10 75 DEPLETION 696 24 11 15 50 72 148 178 119 29 -11 1 0 1 13 18 28 CHAN STOR -9 24 -40 -12 2 18 17 17 -9 -13 -13 EVAPORATION 579 38 115 141 119 53 25 28 61 REG INFLOW 16235 679 306 393 1637 1829 1825 1418 1306 1113 908 435 203 255 1114 1435 1380 RELEASE 18262 734 338 458 1567 1789 1806 2069 2092 1874 1371 594 312 266 923 1124 946 STOR CHANGE -2027 -55 -32 -65 71 40 19 -651 -786 -761 -463 -159 -109 -11 191 311 434 STORAGE 18831 18776 18744 18679 18749 18790 18808 18157 17372 16611 16148 15989 15880 15868 16060 16370 16804 ELEV FTMSL 1607.5 1607.3 1607.2 1607.0 1607.2 1607.4 1607.4 1605.3 1602.6 1600.0 1598.3 1597.7 1597.3 1597.3 1598.0 1599.1 1600.7 DISCH KCFS 23.4 24.7 24.3 25.6 26.3 29.1 30.4 33.6 34.0 31.5 22.3 20.0 22.5 16.8 15.0 18.3 17.0 POWER AVE POWER MW 318 314 330 339 374 391 430 429 392 275 245 275 205 184 225 211 PEAK POW MW 707 706 705 706 707 707 696 682 668 659 657 655 654 658 664 672 ENERGY GWH 2787.8 114.5 52.7 71.3 243.9 278.5 281.2 319.9 319.3 282.1 204.5 88.1 46.1 39.4 136.9 167.4 142.1 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 18133 734 338 458 1567 1789 1806 2061 2068 1843 1344 582 306 260 908 1124 946 RELEASE 18133 734 338 458 1567 1789 1806 2061 2068 1843 1344 582 306 260 908 1124 946 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 23.4 24.7 24.3 25.6 26.3 29.1 30.4 33.5 33.6 31.0 21.8 19.5 22.1 16.4 14.8 18.3 17.0 POWER AVE POWER MW 117 114 120 123 136 142 157 157 147 107 98 111 82 75 90 82 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 1045.5 42.1 19.1 25.9 88.7 101.3 102.3 116.7 117.1 105.7 79.7 35.3 18.6 15.8 55.4 66.8 54.9 --FORT RANDALL-- NAT INFLOW 450 73 34 44 90 65 125 35 25 -20 -8 -4 -4 -30 -15 40 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 146 10 32 39 31 12 5 5 12 REG INFLOW 18357 805 371 501 1653 1845 1919 2068 2046 1797 1292 561 297 250 864 1106 983 RELEASE 18350 506 237 501 1653 1845 1919 2068 2046 1943 1935 882 413 276 761 756 609 STOR CHANGE 7 299 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3116 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1349.9 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 17.5 17.0 17.1 28.0 27.8 30.0 32.3 33.6 33.3 32.7 31.5 29.6 29.8 17.4 12.4 12.3 11.0 POWER AVE POWER MW 140 144 236 234 253 271 283 280 273 252 224 218 127 91 94 88 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1817.1 50.6 24.2 51.0 168.5 187.9 195.3 210.3 208.1 196.2 187.3 80.5 36.6 24.4 67.8 69.6 58.9 --GAVINS POINT-- NAT INFLOW 1300 87 41 52 125 140 150 85 75 80 110 53 25 28 75 75 100 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 11 1 0 -21 1 -4 -4 -3 1 1 2 3 0 23 9 0 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 19502 595 278 532 1773 1962 2041 2109 2104 2018 2035 928 433 322 830 830 712 RELEASE 19502 595 278 532 1773 1962 2041 2109 2091 1993 2035 928 433 322 830 830 750 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 20.0 20.0 20.0 29.8 29.8 31.9 34.3 34.3 34.0 33.5 33.1 31.2 31.2 20.3 13.5 13.5 13.5 POWER AVE POWER MW 69 69 100 100 105 111 111 110 111 111 107 107 72 48 48 48 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 788.2 24.8 11.6 21.7 72.3 78.3 79.6 82.2 82.1 79.8 82.5 38.3 17.9 13.7 35.7 35.7 32.0 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1050 121 56 73 140 170 90 105 75 60 35 25 12 13 10 20 45 DEPLETION 268 7 3 4 22 36 31 39 37 24 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 20284 709 331 601 1891 2096 2100 2175 2129 2029 2059 947 442 332 827 836 780 KCFS 23.8 23.9 33.6 31.8 34.1 35.3 35.4 34.6 34.1 33.5 31.8 31.8 20.9 13.5 13.6 14.0 --TOTAL-- NAT INFLOW 19300 1111 518 666 1725 2570 4755 2615 1030 860 900 413 193 220 375 510 840 DEPLETION 2537 -11 -5 -7 157 464 1310 993 385 -99 -31 -134 -62 -71 -156 -131 -65 CHAN STOR -14 64 0 -21 -49 -51 -7 15 1 42 45 3 0 5 -49 -13 2 EVAPORATION 2074 132 409 505 431 191 88 101 217 STORAGE 56802 57279 57471 57522 57150 57109 58447 57778 55886 54352 52838 52248 51972 51835 51273 51065 51192 SYSTEM POWER AVE POWER MW 926 922 1069 1214 1367 1416 1430 1425 1286 1024 951 987 802 804 895 863 PEAK POW MW 2321 2319 2319 2315 2314 2326 2316 2295 2280 2256 2230 2218 2215 2181 2204 2215 ENERGY GWH 9948.3 333.2 155.0 230.9 874.4 1017.2 1019.6 1064.0 1060.0 926.2 761.7 342.5 165.9 154.0 598.2 665.7 579.8 DAILY GWH 22.2 22.1 25.7 29.1 32.8 34.0 34.3 34.2 30.9 24.6 22.8 23.7 19.2 19.3 21.5 20.7 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:29 STUDY NO 8 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB12 2012 2013 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 5400 194 90 116 470 845 1195 610 270 245 320 158 74 84 230 210 290 DEPLETION 311 -45 -21 -27 55 194 385 188 7 -105 -88 -23 -11 -12 -77 -66 -43 EVAPORATION 537 34 105 129 112 50 23 27 57 MOD INFLOW 4552 239 111 143 415 651 810 388 158 221 296 130 61 70 250 276 333 RELEASE 6844 179 83 107 417 615 684 707 707 523 369 179 83 111 676 738 666 STOR CHANGE -2292 60 28 36 -2 36 126 -319 -549 -302 -72 -48 -22 -42 -426 -462 -333 STORAGE 14785 14845 14873 14909 14907 14943 15069 14750 14201 13900 13827 13779 13756 13715 13288 12826 12493 ELEV FTMSL 2234.0 2234.3 2234.4 2234.6 2234.6 2234.7 2235.3 2233.8 2231.2 2229.7 2229.3 2229.1 2228.9 2228.7 2226.6 2224.1 2222.3 DISCH KCFS 10.0 6.0 6.0 6.0 7.0 10.0 11.5 11.5 11.5 8.8 6.0 6.0 6.0 7.0 11.0 12.0 12.0 POWER AVE POWER MW 82 82 82 96 136 154 154 152 118 81 81 81 94 144 152 151 PEAK POW MW 162 163 163 163 163 163 162 160 159 159 159 159 158 157 155 153 ENERGY GWH 1096.9 29.5 13.8 17.7 68.9 101.3 110.8 114.2 113.2 85.2 60.1 29.0 13.5 18.0 107.1 113.3 101.2 --GARRISON-- NAT INFLOW 7400 365 170 219 575 1055 2205 1080 360 160 390 148 69 79 135 135 255 DEPLETION 934 2 1 1 21 134 609 467 127 -107 -7 -101 -47 -54 -63 -32 -17 CHAN STOR -21 40 -10 -30 -15 27 28 -10 -41 -10 EVAPORATION 597 37 116 144 124 56 26 30 64 REG INFLOW 12692 582 253 325 961 1506 2265 1283 824 673 670 371 173 204 770 895 938 RELEASE 15504 476 222 286 1547 1783 1696 1353 1353 1103 922 446 208 246 1230 1383 1250 STOR CHANGE -2812 106 31 39 -586 -277 569 -70 -529 -430 -252 -75 -35 -42 -460 -489 -311 STORAGE 18107 18212 18243 18283 17696 17419 17988 17918 17389 16959 16707 16632 16597 16555 16095 15606 15295 ELEV FTMSL 1837.5 1837.8 1837.9 1838.1 1836.1 1835.2 1837.1 1836.9 1835.1 1833.6 1832.8 1832.5 1832.4 1832.2 1830.6 1828.9 1827.8 DISCH KCFS 22.0 16.0 16.0 16.0 26.0 29.0 28.5 22.0 22.0 18.5 15.0 15.0 15.0 15.5 20.0 22.5 22.5 POWER AVE POWER MW 199 200 200 321 354 349 272 270 226 182 181 181 187 239 266 263 PEAK POW MW 469 470 470 463 460 467 466 459 454 451 450 449 449 443 437 432 ENERGY GWH 2280.1 71.8 33.5 43.1 231.2 263.7 251.6 202.4 201.1 162.7 135.3 65.2 30.4 35.9 177.8 197.6 176.8 --OAHE-- NAT INFLOW 1150 196 91 118 170 115 255 125 50 65 5 8 4 4 -100 -20 65 DEPLETION 696 24 11 15 50 72 148 178 119 29 -11 1 0 1 13 18 28 CHAN STOR -4 24 -40 -12 2 26 15 16 -2 -20 -11 EVAPORATION 563 37 113 137 115 51 24 27 59 REG INFLOW 15391 672 302 389 1627 1814 1805 1288 1170 1017 839 402 188 220 1038 1334 1287 RELEASE 18273 744 342 464 1582 1804 1826 2084 2112 1894 1391 601 315 267 875 1073 901 STOR CHANGE -2882 -72 -40 -75 46 10 -21 -795 -942 -877 -552 -199 -128 -46 163 262 386 STORAGE 18831 18759 18718 18643 18689 18699 18678 17883 16941 16063 15511 15312 15185 15138 15301 15563 15949 ELEV FTMSL 1607.5 1607.3 1607.1 1606.9 1607.0 1607.1 1607.0 1604.4 1601.1 1598.0 1595.9 1595.2 1594.7 1594.5 1595.1 1596.1 1597.6 DISCH KCFS 23.4 25.0 24.7 26.0 26.6 29.3 30.7 33.9 34.4 31.8 22.6 20.2 22.7 16.8 14.2 17.4 16.2 POWER AVE POWER MW 322 318 334 342 377 394 431 430 392 275 244 273 202 172 211 198 PEAK POW MW 706 706 705 705 706 705 691 674 658 648 644 642 641 644 649 656 ENERGY GWH 2770.9 116.0 53.4 72.1 246.0 280.4 283.8 321.0 320.2 282.3 204.9 87.9 45.9 38.9 127.8 157.2 133.0 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 18144 744 342 464 1582 1804 1826 2076 2088 1863 1364 588 310 260 861 1073 901 RELEASE 18144 744 342 464 1582 1804 1826 2076 2088 1863 1364 588 310 260 861 1073 901 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 23.4 25.0 24.7 26.0 26.6 29.3 30.7 33.8 34.0 31.3 22.2 19.8 22.3 16.4 14.0 17.4 16.2 POWER AVE POWER MW 118 115 122 124 137 144 158 159 148 109 99 112 83 71 86 78 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 1045.8 42.6 19.4 26.3 89.6 102.1 103.4 117.5 118.2 106.8 80.9 35.8 18.8 15.8 52.5 63.8 52.3 --FORT RANDALL-- NAT INFLOW 350 68 32 41 85 60 115 25 15 -10 -30 -13 -6 -7 -40 -20 35 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 146 10 32 39 31 12 5 5 12 REG INFLOW 18268 810 373 503 1663 1855 1929 2073 2056 1807 1302 563 298 248 806 1050 933 RELEASE 18261 512 239 503 1663 1855 1929 2073 2056 1953 1945 884 414 274 703 700 559 STOR CHANGE 7 299 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3116 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1349.9 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 17.5 17.2 17.2 28.2 27.9 30.2 32.4 33.7 33.4 32.8 31.6 29.7 29.8 17.3 11.4 11.4 10.1 POWER AVE POWER MW 142 145 238 235 254 273 283 281 274 253 224 218 126 84 87 80 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1809.5 51.1 24.4 51.3 169.5 188.9 196.3 210.8 209.1 197.2 188.3 80.7 36.7 24.1 62.7 64.5 54.0 --GAVINS POINT-- NAT INFLOW 1200 82 38 49 115 130 140 80 65 70 100 48 22 25 70 70 95 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 13 1 0 -21 0 -4 -4 -2 1 1 2 4 0 23 11 0 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 19315 595 278 532 1773 1962 2041 2109 2104 2018 2035 925 432 317 769 769 656 RELEASE 19315 595 278 532 1773 1962 2041 2109 2091 1993 2035 925 432 317 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 20.0 20.0 20.0 29.8 29.8 31.9 34.3 34.3 34.0 33.5 33.1 31.1 31.1 20.0 12.5 12.5 12.5 POWER AVE POWER MW 69 69 100 100 105 111 111 110 111 111 106 106 71 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 780.3 24.8 11.6 21.7 72.3 78.3 79.6 82.2 82.1 79.8 82.5 38.3 17.9 13.5 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 700 87 41 52 90 120 65 70 40 35 25 18 8 9 5 15 20 DEPLETION 268 7 3 4 22 36 31 39 37 24 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 19747 675 315 580 1841 2046 2075 2140 2094 2004 2049 937 437 324 761 770 699 KCFS 22.7 22.7 32.5 30.9 33.3 34.9 34.8 34.0 33.7 33.3 31.5 31.5 20.4 12.4 12.5 12.6 --TOTAL-- NAT INFLOW 16200 992 463 595 1505 2325 3975 1990 800 565 810 365 170 195 300 390 760 DEPLETION 2403 -11 -5 -7 157 464 1209 929 315 -157 -92 -111 -52 -59 -101 -62 -14 CHAN STOR -12 64 0 -21 -49 -46 -17 23 1 43 46 3 0 11 -50 -21 2 EVAPORATION 2017 129 399 491 419 186 86 98 211 STORAGE 56802 57194 57346 57347 56805 56574 57247 56063 54056 52326 50806 50163 49862 49706 49086 48746 48824 SYSTEM POWER AVE POWER MW 933 929 1075 1219 1364 1424 1409 1403 1270 1011 936 971 762 754 846 814 PEAK POW MW 2320 2318 2317 2311 2308 2315 2299 2274 2256 2231 2204 2192 2188 2153 2175 2185 ENERGY GWH 9783.6 335.8 156.1 232.3 877.4 1014.8 1025.4 1048.2 1044.0 914.1 751.9 336.9 163.2 146.3 560.9 629.4 546.9 DAILY GWH 22.4 22.3 25.8 29.2 32.7 34.2 33.8 33.7 30.5 24.3 22.5 23.3 18.3 18.1 20.3 19.5 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP MEDIAN RUNOFF 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 STUDY NO 9 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB13 2013 2014 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 7200 230 107 138 600 1180 1810 840 315 295 430 180 84 96 300 250 345 DEPLETION 471 -30 -14 -18 28 334 518 240 4 -83 -45 -44 -20 -23 -135 -147 -95 EVAPORATION 459 28 88 110 96 43 20 23 50 MOD INFLOW 6270 259 121 156 572 846 1292 572 223 268 379 180 84 96 385 397 440 RELEASE 6487 179 83 107 476 584 625 646 646 490 369 179 83 119 615 676 611 STOR CHANGE -217 81 38 48 96 262 667 -74 -423 -222 10 2 1 -23 -230 -279 -171 STORAGE 14625 14706 14743 14792 14888 15150 15817 15743 15320 15098 15108 15110 15110 15088 14858 14578 14408 ELEV FTMSL 2233.2 2233.6 2233.8 2234.0 2234.5 2235.7 2238.8 2238.4 2236.5 2235.5 2235.5 2235.5 2235.5 2235.4 2234.3 2233.0 2232.2 DISCH KCFS 10.5 6.0 6.0 6.0 8.0 9.5 10.5 10.5 10.5 8.2 6.0 6.0 6.0 7.5 10.0 11.0 11.0 POWER AVE POWER MW 82 82 82 109 130 143 144 143 113 82 82 82 103 136 147 147 PEAK POW MW 162 162 162 163 163 166 165 164 163 163 163 163 163 162 161 161 ENERGY GWH 1068.5 29.4 13.7 17.7 78.6 96.6 103.2 107.2 106.7 81.4 61.2 29.6 13.8 19.7 101.4 109.6 98.6 --GARRISON-- NAT INFLOW 10800 460 214 276 870 1325 3095 1860 595 460 495 195 91 104 180 260 320 DEPLETION 1111 1 1 1 20 186 798 644 104 -117 -19 -125 -58 -66 -115 -89 -55 CHAN STOR -5 45 -20 -15 -10 22 22 -15 -25 -10 0 EVAPORATION 531 33 103 128 111 50 23 26 56 REG INFLOW 15641 682 297 382 1306 1708 2912 1829 1033 961 794 448 209 248 829 1016 986 RELEASE 15905 476 222 286 1190 1537 1547 1568 1568 1295 1107 536 250 286 1230 1476 1333 STOR CHANGE -264 206 75 96 116 171 1365 261 -535 -334 -313 -87 -41 -37 -401 -460 -347 STORAGE 17908 18113 18188 18285 18401 18572 19937 20198 19663 19329 19017 18929 18889 18852 18451 17991 17644 ELEV FTMSL 1836.8 1837.5 1837.8 1838.1 1838.4 1839.0 1843.2 1843.9 1842.4 1841.3 1840.4 1840.1 1840.0 1839.9 1838.6 1837.1 1836.0 DISCH KCFS 25.0 16.0 16.0 16.0 20.0 25.0 26.0 25.5 25.5 21.8 18.0 18.0 18.0 18.0 20.0 24.0 24.0 POWER AVE POWER MW 199 199 200 250 312 329 326 325 276 228 227 227 227 251 298 296 PEAK POW MW 468 469 470 472 474 498 499 490 482 478 478 477 477 472 467 463 ENERGY GWH 2419.7 71.6 33.5 43.1 179.6 232.2 236.6 242.4 241.8 198.6 169.4 81.9 38.2 43.6 186.7 221.8 198.7 --OAHE-- NAT INFLOW 2300 232 108 139 405 195 780 160 75 95 35 30 14 16 -80 95 DEPLETION 709 24 11 15 50 73 151 182 122 30 -11 1 0 1 13 18 29 CHAN STOR 4 36 -16 -20 -4 2 15 15 -8 -16 EVAPORATION 499 32 98 120 103 46 22 25 54 REG INFLOW 17001 720 319 410 1529 1640 2172 1516 1423 1254 1065 518 242 276 1075 1441 1399 RELEASE 17272 574 267 409 1293 1624 1607 1849 1979 1759 1259 562 296 250 1099 1324 1120 STOR CHANGE -270 146 52 2 236 16 565 -333 -556 -505 -194 -44 -54 26 -24 118 278 STORAGE 18626 18772 18824 18826 19062 19078 19643 19310 18754 18250 18055 18012 17957 17983 17960 18077 18356 ELEV FTMSL 1606.8 1607.3 1607.5 1607.5 1608.2 1608.3 1610.0 1609.0 1607.2 1605.6 1605.0 1604.8 1604.6 1604.7 1604.6 1605.0 1605.9 DISCH KCFS 20.2 19.3 19.2 22.9 21.7 26.4 27.0 30.1 32.2 29.6 20.5 18.9 21.3 15.8 17.9 21.5 20.2 POWER AVE POWER MW 249 248 295 281 342 351 391 415 378 261 241 271 201 228 274 258 PEAK POW MW 707 708 708 712 712 721 716 706 698 694 694 693 693 693 695 700 ENERGY GWH 2689.1 89.6 41.7 63.8 202.4 254.3 252.9 291.2 309.1 272.5 194.5 86.6 45.6 38.6 169.3 203.9 173.3 --BIG BEND-- EVAPORATION 103 6 20 25 22 10 5 5 11 REG INFLOW 17168 574 267 409 1293 1624 1607 1843 1959 1734 1238 552 292 245 1087 1324 1120 RELEASE 17168 574 267 409 1293 1624 1607 1843 1959 1734 1238 552 292 245 1087 1324 1120 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 20.2 19.3 19.2 22.9 21.7 26.4 27.0 30.0 31.9 29.1 20.1 18.6 21.0 15.5 17.7 21.5 20.2 POWER AVE POWER MW 91 90 107 102 124 126 140 149 138 99 93 105 78 89 106 97 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 991.6 32.9 15.1 23.1 73.2 92.0 91.0 104.4 110.9 99.4 73.5 33.6 17.7 15.0 66.2 78.6 65.0 --FORT RANDALL-- NAT INFLOW 900 119 55 71 155 140 135 70 65 30 10 5 5 5 -10 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 117 8 25 31 25 9 4 4 10 REG INFLOW 17871 691 322 479 1444 1755 1730 1887 1984 1726 1212 551 292 246 1079 1311 1162 RELEASE 17871 400 188 479 1444 1755 1730 1887 1984 1872 1855 872 408 272 977 961 788 STOR CHANGE 0 292 134 0 0 -146 -643 -321 -116 -26 102 350 374 STORAGE 3123 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2399 2749 3123 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 14.2 13.4 13.5 26.8 24.3 28.5 29.1 30.7 32.3 31.5 30.2 29.3 29.4 17.1 15.9 15.6 14.2 POWER AVE POWER MW 111 114 226 205 240 245 258 271 263 242 221 215 125 117 119 113 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1764.6 40.0 19.2 48.9 147.6 178.9 176.4 192.2 201.8 189.2 179.7 79.7 36.1 24.0 86.8 88.3 76.0 --GAVINS POINT-- NAT INFLOW 1500 104 49 62 145 160 175 100 90 95 120 60 28 32 80 85 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 1 0 -26 5 -8 -1 -3 -3 2 2 2 0 23 2 0 3 EVAPORATION 36 2 6 9 8 3 2 2 4 REG INFLOW 19221 506 236 516 1589 1888 1880 1943 2054 1965 1968 925 432 322 1045 1045 906 RELEASE 19221 506 236 516 1589 1888 1880 1943 2041 1940 1968 925 432 322 1045 1045 944 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 17.0 17.0 17.0 28.9 26.7 30.7 31.6 31.6 33.2 32.6 32.0 31.1 31.1 20.3 17.0 17.0 17.0 POWER AVE POWER MW 59 59 98 91 103 105 105 109 109 108 106 106 72 60 60 60 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 786.7 21.2 9.9 21.2 65.6 76.3 75.3 77.8 80.9 78.3 80.6 38.3 17.9 13.7 44.7 44.7 40.1 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 138 64 83 325 295 150 180 120 105 55 30 14 16 25 25 75 DEPLETION 269 7 3 4 22 36 31 39 37 25 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 20652 637 297 595 1892 2147 1999 2084 2124 2020 2012 949 443 335 1057 1056 1004 KCFS 21.4 21.4 33.3 31.8 34.9 33.6 33.9 34.5 33.9 32.7 31.9 31.9 21.1 17.2 17.2 18.1 --TOTAL-- NAT INFLOW 24400 1283 598 769 2500 3295 6145 3210 1260 1080 1135 505 236 269 510 610 995 DEPLETION 2754 4 2 2 129 657 1534 1162 292 -143 -61 -155 -72 -83 -211 -200 -103 CHAN STOR -2 82 0 -26 -31 -43 -15 -1 -3 38 39 1 0 8 -31 -26 3 EVAPORATION 1744 109 341 423 364 162 75 86 185 STORAGE 56245 56969 57268 57415 57863 58312 60909 60763 59262 58080 56941 56490 56280 56220 55668 55396 55493 SYSTEM POWER AVE POWER MW 791 793 1008 1037 1250 1299 1364 1413 1277 1020 971 1008 805 880 1004 970 PEAK POW MW 2319 2318 2320 2325 2329 2365 2360 2341 2327 2310 2286 2276 2273 2237 2258 2267 ENERGY GWH 9720.1 284.8 133.1 217.8 746.9 930.2 935.4 1015.1 1051.3 919.4 758.9 349.6 169.3 154.6 655.1 746.9 651.7 DAILY GWH 19.0 19.0 24.2 24.9 30.0 31.2 32.7 33.9 30.6 24.5 23.3 24.2 19.3 21.1 24.1 23.3 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP MEDIAN RUNOFF 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 STUDY NO 10 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB14 2014 2015 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 7200 230 107 138 600 1180 1810 840 315 295 430 180 84 96 300 250 345 DEPLETION 487 -25 -12 -15 15 305 561 255 16 -102 -45 -44 -21 -23 -136 -148 -95 EVAPORATION 453 28 87 108 94 43 20 23 49 MOD INFLOW 6260 255 119 153 585 875 1249 557 212 289 381 181 85 97 387 398 440 RELEASE 6473 179 83 107 417 615 655 676 676 496 369 179 83 95 615 646 583 STOR CHANGE -213 76 35 46 168 260 594 -119 -465 -207 12 3 1 1 -228 -248 -143 STORAGE 14408 14484 14519 14565 14733 14993 15588 15468 15004 14796 14808 14811 14812 14813 14585 14338 14195 ELEV FTMSL 2232.2 2232.5 2232.7 2232.9 2233.7 2235.0 2237.7 2237.2 2235.0 2234.0 2234.1 2234.1 2234.1 2234.1 2233.0 2231.8 2231.1 DISCH KCFS 11.0 6.0 6.0 6.0 7.0 10.0 11.0 11.0 11.0 8.3 6.0 6.0 6.0 6.0 10.0 10.5 10.5 POWER AVE POWER MW 81 82 82 95 136 149 149 149 114 82 82 82 82 136 141 141 PEAK POW MW 161 161 161 162 163 165 165 163 162 162 162 162 162 162 161 160 ENERGY GWH 1061.7 29.3 13.7 17.6 68.6 101.2 107.2 111.2 110.7 81.9 60.9 29.5 13.8 15.7 101.0 104.9 94.4 --GARRISON-- NAT INFLOW 10800 460 214 276 870 1325 3095 1860 595 460 495 195 91 104 180 260 320 DEPLETION 1090 3 1 2 24 151 803 657 110 -120 -23 -128 -60 -68 -117 -90 -55 CHAN STOR 5 50 -10 -30 -10 26 23 -39 -5 EVAPORATION 522 32 102 126 109 49 23 26 56 REG INFLOW 15666 685 296 381 1253 1759 2937 1847 1060 976 801 453 211 241 817 991 958 RELEASE 15926 476 222 286 1190 1660 1607 1599 1599 1253 1015 491 229 262 1230 1476 1333 STOR CHANGE -260 209 74 95 63 99 1330 248 -539 -277 -214 -38 -18 -20 -413 -485 -375 STORAGE 17644 17853 17927 18023 18085 18184 19514 19762 19223 18947 18733 18695 18677 18656 18243 17758 17384 ELEV FTMSL 1836.0 1836.7 1836.9 1837.2 1837.4 1837.7 1841.9 1842.6 1841.0 1840.2 1839.5 1839.4 1839.3 1839.2 1837.9 1836.3 1835.1 DISCH KCFS 24.0 16.0 16.0 16.0 20.0 27.0 27.0 26.0 26.0 21.1 16.5 16.5 16.5 16.5 20.0 24.0 24.0 POWER AVE POWER MW 198 198 199 248 334 339 330 329 266 208 208 208 208 250 297 294 PEAK POW MW 465 466 467 468 469 486 494 480 478 475 475 475 475 470 464 459 ENERGY GWH 2409.5 71.2 33.3 42.9 178.6 248.7 244.0 245.4 244.8 191.6 155.0 74.8 34.9 39.9 186.0 220.8 197.7 --OAHE-- NAT INFLOW 2300 232 108 139 405 195 780 160 75 95 35 30 14 16 -80 95 DEPLETION 724 25 12 15 51 75 154 187 125 30 -12 1 0 1 13 19 29 CHAN STOR 0 32 -16 -28 4 20 19 -14 -17 EVAPORATION 496 31 97 120 103 46 21 24 53 REG INFLOW 17006 716 319 410 1528 1752 2233 1544 1451 1218 978 474 221 253 1069 1440 1399 RELEASE 17272 574 267 409 1293 1624 1607 1849 1979 1759 1259 562 296 250 1099 1324 1120 STOR CHANGE -266 142 52 2 235 128 625 -305 -528 -541 -282 -88 -75 2 -29 116 278 STORAGE 18356 18497 18549 18551 18786 18915 19540 19235 18707 18166 17884 17797 17722 17724 17695 17811 18090 ELEV FTMSL 1605.9 1606.4 1606.6 1606.6 1607.3 1607.8 1609.7 1608.8 1607.1 1605.3 1604.4 1604.1 1603.8 1603.8 1603.7 1604.1 1605.1 DISCH KCFS 20.2 19.3 19.2 22.9 21.7 26.4 27.0 30.1 32.2 29.6 20.5 18.9 21.3 15.8 17.9 21.5 20.2 POWER AVE POWER MW 248 247 294 280 341 350 391 415 378 261 240 270 200 226 273 257 PEAK POW MW 702 703 703 707 709 720 715 706 696 691 690 688 688 688 690 695 ENERGY GWH 2680.9 89.2 41.5 63.5 201.4 253.4 252.3 290.8 308.8 272.2 194.0 86.3 45.4 38.4 168.4 202.9 172.4 --BIG BEND-- EVAPORATION 103 6 20 25 22 10 5 5 11 REG INFLOW 17168 574 267 409 1293 1624 1607 1843 1959 1734 1238 552 292 245 1087 1324 1120 RELEASE 17168 574 267 409 1293 1624 1607 1843 1959 1734 1238 552 292 245 1087 1324 1120 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 20.2 19.3 19.2 22.9 21.7 26.4 27.0 30.0 31.9 29.1 20.1 18.6 21.0 15.5 17.7 21.5 20.2 POWER AVE POWER MW 91 90 107 102 124 126 140 149 138 99 93 105 78 89 106 97 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 991.6 32.9 15.1 23.1 73.2 92.0 91.0 104.4 110.9 99.4 73.5 33.6 17.7 15.0 66.2 78.6 65.0 --FORT RANDALL-- NAT INFLOW 900 119 55 71 155 140 135 70 65 30 10 5 5 5 -10 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 117 8 25 31 25 9 4 4 10 REG INFLOW 17871 691 322 479 1444 1755 1730 1887 1984 1726 1212 551 292 246 1079 1311 1162 RELEASE 17871 400 188 479 1444 1755 1730 1887 1984 1872 1855 872 408 272 977 961 788 STOR CHANGE 0 292 134 0 0 -146 -643 -321 -116 -26 102 350 374 STORAGE 3123 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2399 2749 3123 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 14.2 13.4 13.5 26.8 24.3 28.5 29.1 30.7 32.3 31.5 30.2 29.3 29.4 17.1 15.9 15.6 14.2 POWER AVE POWER MW 111 114 226 205 240 245 258 271 263 242 221 215 125 117 119 113 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1764.6 40.0 19.2 48.9 147.6 178.9 176.4 192.2 201.8 189.2 179.7 79.7 36.1 24.0 86.8 88.3 76.0 --GAVINS POINT-- NAT INFLOW 1500 104 49 62 145 160 175 100 90 95 120 60 28 32 80 85 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 1 0 -26 5 -8 -1 -3 -3 2 2 2 0 23 2 0 3 EVAPORATION 36 2 6 9 8 3 2 2 4 REG INFLOW 19221 506 236 516 1589 1888 1880 1943 2054 1965 1968 925 432 322 1045 1045 906 RELEASE 19221 506 236 516 1589 1888 1880 1943 2041 1940 1968 925 432 322 1045 1045 944 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 17.0 17.0 17.0 28.9 26.7 30.7 31.6 31.6 33.2 32.6 32.0 31.1 31.1 20.3 17.0 17.0 17.0 POWER AVE POWER MW 59 59 98 91 103 105 105 109 109 108 106 106 72 60 60 60 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 786.7 21.2 9.9 21.2 65.6 76.3 75.3 77.8 80.9 78.3 80.6 38.3 17.9 13.7 44.7 44.7 40.1 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 138 64 83 325 295 150 180 120 105 55 30 14 16 25 25 75 DEPLETION 276 7 3 4 23 36 32 39 38 25 11 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 20645 636 297 594 1891 2147 1998 2084 2123 2020 2012 949 443 335 1056 1055 1004 KCFS 21.4 21.4 33.3 31.8 34.9 33.6 33.9 34.5 33.9 32.7 31.9 31.9 21.1 17.2 17.2 18.1 --TOTAL-- NAT INFLOW 24400 1283 598 769 2500 3295 6145 3210 1260 1080 1135 505 236 269 510 610 995 DEPLETION 2771 11 5 7 122 595 1586 1195 314 -165 -66 -159 -74 -85 -213 -200 -103 CHAN STOR 3 84 0 -26 -21 -66 -11 1 -3 47 44 1 0 23 -52 -21 3 EVAPORATION 1726 108 338 419 360 160 74 85 183 STORAGE 55493 56212 56507 56650 57116 57604 60154 59977 58459 57313 56186 55742 55534 55492 54924 54658 54754 SYSTEM POWER AVE POWER MW 788 790 1006 1021 1278 1314 1373 1422 1268 1000 950 986 764 878 995 961 PEAK POW MW 2310 2310 2311 2316 2321 2350 2353 2330 2321 2303 2278 2268 2265 2229 2249 2258 ENERGY GWH 9695.0 283.9 132.7 217.2 735.0 950.5 946.2 1021.7 1057.9 912.7 743.7 342.1 165.7 146.7 653.1 740.2 645.6 DAILY GWH 18.9 19.0 24.1 24.5 30.7 31.5 33.0 34.1 30.4 24.0 22.8 23.7 18.3 21.1 23.9 23.1 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP MEDIAN RUNOFF 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 STUDY NO 11 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB15 2015 2016 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB --FORT PECK-- NAT INFLOW 7200 230 107 138 600 1180 1810 840 315 295 430 180 84 96 300 250 345 DEPLETION 495 -25 -12 -15 15 306 565 263 22 -101 -48 -44 -21 -23 -135 -146 -106 EVAPORATION 448 28 86 107 94 42 20 23 49 MOD INFLOW 6257 255 119 153 585 874 1245 549 207 289 384 182 85 97 386 396 451 RELEASE 6455 179 83 107 476 584 625 646 646 495 369 179 83 119 615 646 604 STOR CHANGE -198 77 36 46 109 290 620 -96 -439 -207 16 3 1 -22 -229 -250 -153 STORAGE 14195 14271 14307 14353 14462 14751 15372 15275 14836 14630 14645 14648 14650 14628 14399 14149 13996 ELEV FTMSL 2231.1 2231.5 2231.7 2231.9 2232.4 2233.8 2236.7 2236.3 2234.2 2233.2 2233.3 2233.3 2233.3 2233.2 2232.1 2230.9 2230.2 DISCH KCFS 10.5 6.0 6.0 6.0 8.0 9.5 10.5 10.5 10.5 8.3 6.0 6.0 6.0 7.5 10.0 10.5 10.5 POWER AVE POWER MW 81 81 81 108 129 142 143 142 113 82 82 82 102 135 141 140 PEAK POW MW 160 161 161 161 162 164 164 162 162 162 162 162 162 161 160 159 ENERGY GWH 1057.3 29.2 13.7 17.6 78.1 96.0 102.5 106.4 105.9 81.6 60.8 29.4 13.7 19.6 100.7 104.6 97.5 --GARRISON-- NAT INFLOW 10800 460 214 276 870 1325 3095 1860 595 460 495 195 91 104 180 260 320 DEPLETION 1102 3 2 2 24 151 813 673 116 -123 -28 -132 -61 -70 -117 -90 -61 CHAN STOR 0 45 -20 -15 -10 21 23 -15 -25 -5 EVAPORATION 519 32 101 126 108 48 23 26 55 REG INFLOW 15634 680 296 381 1302 1743 2897 1800 1023 974 807 457 213 253 832 991 985 RELEASE 15879 476 222 286 1190 1537 1547 1537 1537 1282 1107 536 250 286 1230 1476 1381 STOR CHANGE -245 204 74 95 112 206 1350 263 -514 -308 -300 -79 -37 -33 -398 -485 -396 STORAGE 17384 17588 17662 17757 17869 18075 19425 19688 19174 18866 18565 18486 18450 18417 18019 17534 17138 ELEV FTMSL 1835.1 1835.8 1836.0 1836.3 1836.7 1837.4 1841.6 1842.4 1840.9 1839.9 1839.0 1838.7 1838.6 1838.5 1837.2 1835.6 1834.3 DISCH KCFS 24.0 16.0 16.0 16.0 20.0 25.0 26.0 25.0 25.0 21.6 18.0 18.0 18.0 18.0 20.0 24.0 24.0 POWER AVE POWER MW 197 197 198 247 309 326 317 316 272 226 226 225 225 249 295 293 PEAK POW MW 462 463 464 465 468 483 491 480 477 473 473 472 472 467 461 456 ENERGY GWH 2395.2 70.8 33.1 42.7 177.7 229.8 234.7 235.7 235.3 196.0 168.5 81.2 37.8 43.2 185.2 219.8 203.7 --OAHE-- NAT INFLOW 2300 232 108 139 405 195 780 160 75 95 35 30 14 16 -80 95 DEPLETION 736 25 12 15 51 76 157 191 128 31 -12 1 0 1 13 19 29 CHAN STOR 0 33 -16 -20 -4 4 14 15 -8 -17 EVAPORATION 484 31 95 116 100 45 21 24 52 REG INFLOW 16959 716 319 410 1528 1636 2166 1479 1389 1244 1068 519 242 277 1076 1440 1447 RELEASE 17211 574 267 409 1293 1624 1607 1849 1979 1759 1259 562 296 247 1067 1293 1126 STOR CHANGE -252 142 52 2 235 12 559 -370 -589 -515 -191 -42 -54 30 9 147 321 STORAGE 18090 18232 18284 18285 18520 18533 19091 18722 18132 17617 17426 17384 17330 17361 17370 17516 17837 ELEV FTMSL 1605.1 1605.5 1605.7 1605.7 1606.5 1606.5 1608.3 1607.1 1605.2 1603.5 1602.8 1602.7 1602.5 1602.6 1602.6 1603.1 1604.2 DISCH KCFS 20.2 19.3 19.2 22.9 21.7 26.4 27.0 30.1 32.2 29.6 20.5 18.9 21.3 15.6 17.4 21.0 19.6 POWER AVE POWER MW 246 246 293 278 339 348 388 411 374 258 238 268 196 219 265 248 PEAK POW MW 697 698 698 702 703 712 706 696 687 683 682 681 682 682 685 691 ENERGY GWH 2652.6 88.7 41.3 63.2 200.5 252.0 250.6 288.5 305.8 269.4 192.2 85.6 45.1 37.6 162.6 197.1 172.4 --BIG BEND-- EVAPORATION 103 6 20 25 22 10 5 5 11 REG INFLOW 17108 574 267 409 1293 1624 1607 1843 1959 1734 1238 552 292 242 1056 1293 1126 RELEASE 17108 574 267 409 1293 1624 1607 1843 1959 1734 1238 552 292 242 1056 1293 1126 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 20.2 19.3 19.2 22.9 21.7 26.4 27.0 30.0 31.9 29.1 20.1 18.6 21.0 15.2 17.2 21.0 19.6 POWER AVE POWER MW 91 90 107 102 124 126 140 149 138 99 93 105 77 86 103 94 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 988.1 32.9 15.1 23.1 73.2 92.0 91.0 104.4 110.9 99.4 73.5 33.6 17.7 14.7 64.3 76.8 65.3 --FORT RANDALL-- NAT INFLOW 900 119 55 71 155 140 135 70 65 30 10 5 5 5 -10 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 117 8 25 31 25 9 4 4 10 REG INFLOW 17811 691 322 479 1444 1755 1730 1887 1984 1726 1212 551 292 243 1048 1280 1168 RELEASE 17811 400 188 479 1444 1755 1730 1887 1984 1872 1855 872 408 268 946 930 794 STOR CHANGE 0 292 134 0 0 -146 -643 -321 -116 -26 102 350 374 STORAGE 3123 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2399 2749 3123 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 14.2 13.4 13.5 26.8 24.3 28.5 29.1 30.7 32.3 31.5 30.2 29.3 29.4 16.9 15.4 15.1 13.8 POWER AVE POWER MW 111 114 226 205 240 245 258 271 263 242 221 215 123 113 115 110 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1759.3 40.0 19.2 48.9 147.6 178.9 176.4 192.2 201.8 189.2 179.7 79.7 36.1 23.7 84.1 85.5 76.5 --GAVINS POINT-- NAT INFLOW 1500 104 49 62 145 160 175 100 90 95 120 60 28 32 80 85 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 0 1 0 -26 5 -8 -1 -3 -3 2 2 2 0 23 3 0 2 EVAPORATION 36 2 6 9 8 3 2 2 4 REG INFLOW 19161 506 236 516 1589 1888 1880 1943 2054 1965 1968 925 432 319 1015 1015 911 RELEASE 19161 506 236 516 1589 1888 1880 1943 2041 1940 1968 925 432 319 1015 1015 949 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 17.0 17.0 17.0 28.9 26.7 30.7 31.6 31.6 33.2 32.6 32.0 31.1 31.1 20.1 16.5 16.5 16.5 POWER AVE POWER MW 59 59 98 91 103 105 105 109 109 108 106 106 71 58 58 58 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 784.2 21.2 9.9 21.2 65.6 76.3 75.3 77.8 80.9 78.3 80.6 38.3 17.9 13.6 43.4 43.4 40.3 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 138 64 83 325 295 150 180 120 105 55 30 14 16 25 25 75 DEPLETION 277 7 3 4 23 36 32 40 38 25 11 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 20584 636 297 594 1891 2147 1998 2083 2123 2020 2012 949 443 332 1026 1025 1009 KCFS 21.4 21.4 33.3 31.8 34.9 33.6 33.9 34.5 33.9 32.7 31.9 31.9 20.9 16.7 16.7 17.5 --TOTAL-- NAT INFLOW 24400 1283 598 769 2500 3295 6145 3210 1260 1080 1135 505 236 269 510 610 995 DEPLETION 2804 11 5 7 122 597 1603 1224 329 -166 -74 -162 -76 -86 -212 -198 -120 CHAN STOR -1 79 0 -26 -31 -43 -15 1 -3 37 40 1 0 9 -30 -21 2 EVAPORATION 1707 107 334 414 356 159 73 84 181 STORAGE 54754 55468 55764 55907 56363 56871 59400 59197 57667 56516 55398 54959 54753 54703 54188 53950 54058 SYSTEM POWER AVE POWER MW 786 788 1003 1031 1243 1292 1351 1399 1269 1015 966 1002 794 861 977 942 PEAK POW MW 2302 2301 2302 2308 2312 2339 2340 2318 2310 2292 2268 2258 2255 2219 2241 2250 ENERGY GWH 9636.6 282.9 132.3 216.6 742.6 924.9 930.5 1005.0 1040.7 914.0 755.3 347.8 168.3 152.5 640.3 727.1 655.7 DAILY GWH 18.9 18.9 24.1 24.8 29.8 31.0 32.4 33.6 30.5 24.4 23.2 24.0 19.1 20.7 23.5 22.6 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB

DATE OF STUDY 11/30/11 2011-2012 AOP MEDIAN RUNOFF 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 STUDY NO 12 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB16 2016 2017 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 7200 230 107 138 600 1180 1810 840 315 295 430 180 84 96 300 250 345 DEPLETION 512 -24 -11 -15 15 307 569 270 25 -102 -51 -45 -21 -24 -137 -148 -96 EVAPORATION 443 27 85 106 92 42 19 22 48 MOD INFLOW 6245 254 119 152 585 873 1241 543 205 291 389 183 86 98 389 398 441 RELEASE 6367 179 83 107 417 584 655 676 676 509 369 179 83 95 584 615 555 STOR CHANGE -121 76 35 45 168 289 586 -134 -472 -218 20 5 2 3 -195 -217 -114 STORAGE 13996 14072 14107 14152 14321 14610 15196 15062 14591 14372 14392 14397 14399 14402 14206 13989 13875 ELEV FTMSL 2230.2 2230.5 2230.7 2230.9 2231.7 2233.1 2235.9 2235.3 2233.1 2232.0 2232.1 2232.1 2232.1 2232.1 2231.2 2230.1 2229.5 DISCH KCFS 10.5 6.0 6.0 6.0 7.0 9.5 11.0 11.0 11.0 8.6 6.0 6.0 6.0 6.0 9.5 10.0 10.0 POWER AVE POWER MW 81 81 81 95 129 148 148 148 116 81 81 81 81 128 135 134 PEAK POW MW 160 160 160 161 162 164 163 162 161 161 161 161 161 160 159 159 ENERGY GWH 1039.6 29.1 13.6 17.5 68.2 95.8 106.4 110.4 109.8 83.6 60.6 29.3 13.7 15.6 95.6 100.1 90.2 --GARRISON-- NAT INFLOW 10800 460 214 276 870 1325 3095 1860 595 460 495 195 91 104 180 260 320 DEPLETION 1124 4 2 2 25 148 826 692 121 -126 -32 -136 -63 -72 -120 -91 -56 CHAN STOR 5 45 -10 -25 -15 24 25 -35 -5 EVAPORATION 512 32 99 123 107 48 22 26 55 REG INFLOW 15536 680 296 381 1252 1736 2909 1813 1051 996 815 461 215 246 795 961 931 RELEASE 15684 476 222 286 1160 1660 1547 1568 1568 1223 984 476 222 254 1230 1476 1333 STOR CHANGE -148 204 74 95 91 76 1361 245 -517 -226 -169 -15 -7 -8 -435 -515 -402 STORAGE 17138 17342 17416 17511 17602 17678 19039 19284 18767 18541 18371 18356 18349 18342 17906 17392 16990 ELEV FTMSL 1834.3 1834.9 1835.2 1835.5 1835.8 1836.1 1840.4 1841.2 1839.6 1838.9 1838.3 1838.3 1838.3 1838.2 1836.8 1835.1 1833.8 DISCH KCFS 24.0 16.0 16.0 16.0 19.5 27.0 26.0 25.5 25.5 20.5 16.0 16.0 16.0 16.0 20.0 24.0 24.0 POWER AVE POWER MW 196 196 197 239 331 323 322 321 258 200 200 200 200 248 295 292 PEAK POW MW 459 460 461 462 463 479 482 476 473 471 471 471 471 466 459 454 ENERGY GWH 2355.0 70.4 33.0 42.5 172.4 246.2 232.9 239.7 239.1 185.6 149.2 72.0 33.6 38.4 184.8 219.2 196.1 --OAHE-- NAT INFLOW 2300 232 108 139 405 195 780 160 75 95 35 30 14 16 -80 95 DEPLETION 752 25 12 15 52 77 160 195 132 32 -12 1 0 1 13 19 30 CHAN STOR 0 33 -14 -30 4 2 20 19 -17 -17 EVAPORATION 480 30 94 116 99 44 21 24 51 REG INFLOW 16752 716 319 410 1499 1748 2171 1504 1417 1190 951 461 215 246 1069 1440 1398 RELEASE 16904 553 257 410 1293 1624 1607 1849 1979 1759 1259 562 296 236 986 1213 1021 STOR CHANGE -152 163 62 0 206 124 564 -345 -562 -569 -309 -101 -81 10 82 227 377 STORAGE 17837 18001 18062 18062 18269 18392 18956 18611 18049 17480 17172 17070 16989 16999 17081 17308 17685 ELEV FTMSL 1604.2 1604.8 1605.0 1605.0 1605.7 1606.1 1607.9 1606.8 1604.9 1603.0 1601.9 1601.6 1601.3 1601.3 1601.6 1602.4 1603.7 DISCH KCFS 19.6 18.6 18.5 23.0 21.7 26.4 27.0 30.1 32.2 29.6 20.5 18.9 21.3 14.9 16.0 19.7 18.4 POWER AVE POWER MW 236 236 292 277 337 347 387 410 373 257 237 267 186 201 247 232 PEAK POW MW 693 694 694 698 700 710 704 694 684 678 677 675 675 677 681 688 ENERGY GWH 2597.1 85.1 39.7 63.2 199.6 251.1 250.0 287.9 305.3 268.9 191.5 85.2 44.8 35.7 149.4 184.1 155.8 --BIG BEND-- EVAPORATION 103 6 20 25 22 10 5 5 11 REG INFLOW 16801 553 257 410 1293 1624 1607 1843 1959 1734 1238 552 292 231 975 1213 1021 RELEASE 16801 553 257 410 1293 1624 1607 1843 1959 1734 1238 552 292 231 975 1213 1021 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 19.6 18.6 18.5 23.0 21.7 26.4 27.0 30.0 31.9 29.1 20.1 18.6 21.0 14.5 15.9 19.7 18.4 POWER AVE POWER MW 88 87 108 102 124 126 140 149 138 99 93 105 73 80 97 88 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 970.0 31.7 14.6 23.2 73.2 92.0 91.0 104.4 110.9 99.4 73.5 33.6 17.7 14.1 59.4 72.1 59.2 --FORT RANDALL-- NAT INFLOW 900 119 55 71 155 140 135 70 65 30 10 5 5 5 -10 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 117 8 25 31 25 9 4 4 10 REG INFLOW 17505 670 312 480 1444 1755 1730 1887 1984 1726 1212 551 292 232 967 1200 1063 RELEASE 17504 378 178 480 1444 1755 1730 1887 1984 1872 1855 872 408 258 865 850 689 STOR CHANGE 0 292 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3123 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 13.8 12.7 12.8 26.9 24.3 28.5 29.1 30.7 32.3 31.5 30.2 29.3 29.4 16.2 14.1 13.8 12.4 POWER AVE POWER MW 105 108 227 205 240 245 258 271 263 242 221 215 118 103 105 99 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1730.9 37.9 18.2 49.0 147.5 178.9 176.4 192.2 201.8 189.2 179.7 79.7 36.1 22.7 76.9 78.2 66.5 --GAVINS POINT-- NAT INFLOW 1500 104 49 62 145 160 175 100 90 95 120 60 28 32 80 85 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 1 2 0 -27 5 -8 -1 -3 -3 2 2 2 0 24 4 0 3 EVAPORATION 36 2 6 9 8 3 2 2 4 REG INFLOW 18856 485 226 516 1589 1888 1880 1943 2054 1965 1968 925 432 309 935 935 806 RELEASE 18856 485 226 516 1589 1888 1880 1943 2041 1940 1968 925 432 309 935 935 844 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 16.5 16.3 16.3 28.9 26.7 30.7 31.6 31.6 33.2 32.6 32.0 31.1 31.1 19.5 15.2 15.2 15.2 POWER AVE POWER MW 57 57 98 91 103 105 105 109 109 108 106 106 69 54 54 53 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 771.4 20.4 9.5 21.2 65.6 76.3 75.3 77.8 80.9 78.3 80.6 38.3 17.9 13.2 40.1 40.1 35.9 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 138 64 83 325 295 150 180 120 105 55 30 14 16 25 25 75 DEPLETION 280 7 3 4 24 37 32 40 38 25 12 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 20276 616 287 594 1890 2146 1998 2083 2123 2020 2011 949 443 322 946 945 904 KCFS 20.7 20.7 33.3 31.8 34.9 33.6 33.9 34.5 33.9 32.7 31.9 31.9 20.3 15.4 15.4 16.3 --TOTAL-- NAT INFLOW 24400 1283 598 769 2500 3295 6145 3210 1260 1080 1135 505 236 269 510 610 995 DEPLETION 2862 13 6 8 125 597 1623 1254 341 -169 -80 -167 -78 -89 -217 -201 -104 CHAN STOR 6 80 0 -27 -19 -64 -12 -1 -3 46 47 1 0 25 -48 -21 3 EVAPORATION 1690 106 330 410 352 157 73 83 179 STORAGE 54058 54793 55097 55237 55703 56192 58704 58470 56932 55797 54696 54264 54062 54040 53595 53439 53637 SYSTEM POWER AVE POWER MW 763 765 1003 1009 1264 1294 1361 1408 1257 988 939 975 728 815 932 898 PEAK POW MW 2294 2294 2295 2300 2304 2332 2328 2312 2303 2284 2260 2249 2247 2212 2235 2245 ENERGY GWH 9464.1 274.6 128.5 216.6 726.5 940.2 932.0 1012.4 1047.9 905.0 735.0 338.0 163.7 139.8 606.3 693.7 603.7 DAILY GWH 18.3 18.4 24.1 24.2 30.3 31.1 32.7 33.8 30.2 23.7 22.5 23.4 17.5 19.6 22.4 21.6 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP MEDIAN RUNOFF 99001 9901 4 PAGE 1 TIME OF STUDY 13:49:44 STUDY NO 13 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB17 2017 2018 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 7200 230 107 138 600 1180 1810 840 315 295 430 180 84 96 300 250 345 DEPLETION 519 -25 -12 -15 15 308 573 277 29 -103 -53 -46 -21 -25 -138 -149 -96 EVAPORATION 440 27 85 105 92 41 19 22 48 MOD INFLOW 6241 255 119 153 585 872 1237 536 201 293 391 185 86 98 390 399 441 RELEASE 6314 179 83 107 476 584 625 646 646 520 369 179 83 95 553 615 555 STOR CHANGE -73 77 36 46 109 288 612 -110 -445 -227 22 6 3 3 -163 -216 -114 STORAGE 13875 13952 13987 14033 14142 14430 15042 14932 14488 14261 14283 14289 14292 14295 14132 13916 13802 ELEV FTMSL 2229.5 2229.9 2230.1 2230.3 2230.9 2232.3 2235.2 2234.7 2232.6 2231.5 2231.6 2231.6 2231.6 2231.6 2230.8 2229.8 2229.2 DISCH KCFS 10.0 6.0 6.0 6.0 8.0 9.5 10.5 10.5 10.5 8.7 6.0 6.0 6.0 6.0 9.0 10.0 10.0 POWER AVE POWER MW 81 81 81 108 128 142 142 142 118 81 81 81 81 122 134 134 PEAK POW MW 159 159 160 160 161 163 163 161 160 160 160 160 160 160 159 159 ENERGY GWH 1031.1 29.1 13.6 17.5 77.7 95.6 102.0 105.8 105.3 85.1 60.5 29.3 13.7 15.6 90.4 100.0 90.0 --GARRISON-- NAT INFLOW 10800 460 214 276 870 1325 3095 1860 595 460 495 195 91 104 180 260 320 DEPLETION 1137 4 2 3 26 151 834 706 126 -129 -37 -139 -65 -74 -122 -92 -57 CHAN STOR 0 40 -20 -15 -10 17 27 -30 -10 EVAPORATION 512 32 100 124 107 48 22 25 55 REG INFLOW 15465 674 296 380 1300 1743 2876 1768 1015 1002 821 465 217 248 771 957 932 RELEASE 15555 476 222 286 1071 1537 1547 1537 1537 1247 1045 506 236 270 1230 1476 1333 STOR CHANGE -90 198 74 95 229 206 1329 231 -522 -244 -224 -41 -19 -22 -459 -519 -401 STORAGE 16990 17188 17262 17357 17585 17791 19120 19351 18828 18584 18360 18319 18300 18278 17819 17300 16900 ELEV FTMSL 1833.8 1834.4 1834.7 1835.0 1835.8 1836.5 1840.7 1841.4 1839.8 1839.0 1838.3 1838.2 1838.1 1838.0 1836.5 1834.8 1833.4 DISCH KCFS 24.0 16.0 16.0 16.0 18.0 25.0 26.0 25.0 25.0 20.9 17.0 17.0 17.0 17.0 20.0 24.0 24.0 POWER AVE POWER MW 195 196 196 221 307 324 316 316 263 213 212 212 212 248 294 291 PEAK POW MW 457 458 459 462 464 480 482 477 474 471 471 470 470 465 458 453 ENERGY GWH 2335.6 70.2 32.8 42.3 159.0 228.4 233.3 235.1 234.8 189.3 158.4 76.5 35.7 40.7 184.6 218.8 195.7 --OAHE-- NAT INFLOW 2300 232 108 139 405 195 780 160 75 95 35 30 14 16 -80 95 DEPLETION 765 25 12 15 52 78 163 200 135 32 -13 1 0 1 14 20 30 CHAN STOR 0 33 -8 -29 -4 4 17 17 0 -13 -17 EVAPORATION 473 30 93 114 98 44 20 23 51 REG INFLOW 16617 716 319 410 1416 1626 2160 1471 1385 1212 1012 491 229 262 1072 1439 1398 RELEASE 16710 520 242 410 1286 1618 1601 1850 1979 1759 1259 562 296 232 942 1170 982 STOR CHANGE -92 196 77 -1 129 8 559 -378 -594 -547 -247 -71 -67 29 130 269 416 STORAGE 17685 17881 17958 17957 18087 18095 18653 18275 17681 17134 16887 16816 16749 16778 16908 17177 17593 ELEV FTMSL 1603.7 1604.4 1604.6 1604.6 1605.1 1605.1 1606.9 1605.7 1603.7 1601.8 1600.9 1600.7 1600.5 1600.6 1601.0 1602.0 1603.4 DISCH KCFS 18.4 17.5 17.4 23.0 21.6 26.3 26.9 30.1 32.2 29.6 20.5 18.9 21.3 14.6 15.3 19.0 17.7 POWER AVE POWER MW 222 222 292 275 335 344 385 408 371 256 235 265 182 191 238 223 PEAK POW MW 691 693 693 695 695 705 698 688 678 673 672 671 671 674 679 686 ENERGY GWH 2555.6 79.9 37.2 63.1 198.1 249.0 247.7 286.3 303.4 267.1 190.4 84.7 44.6 35.0 142.3 177.1 149.6 --BIG BEND-- EVAPORATION 103 6 20 25 22 10 5 5 11 REG INFLOW 16606 520 242 410 1286 1618 1601 1843 1959 1734 1238 552 292 227 931 1170 982 RELEASE 16606 520 242 410 1286 1618 1601 1843 1959 1734 1238 552 292 227 931 1170 982 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 18.4 17.5 17.4 23.0 21.6 26.3 26.9 30.0 31.9 29.1 20.1 18.6 21.0 14.3 15.1 19.0 17.7 POWER AVE POWER MW 83 82 108 101 123 126 140 149 138 99 93 105 72 76 93 85 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 958.7 29.8 13.7 23.2 72.9 91.6 90.7 104.4 110.9 99.4 73.5 33.6 17.7 13.9 56.8 69.5 57.0 --FORT RANDALL-- NAT INFLOW 900 119 55 71 155 140 135 70 65 30 10 5 5 5 -10 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 117 8 25 31 25 9 4 4 10 REG INFLOW 17310 638 296 481 1437 1749 1724 1887 1984 1726 1212 551 292 228 923 1157 1024 RELEASE 17310 346 162 481 1437 1749 1724 1887 1984 1872 1855 872 408 254 821 807 650 STOR CHANGE 0 291 134 0 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 12.4 11.6 11.7 26.9 24.2 28.4 29.0 30.7 32.3 31.5 30.2 29.3 29.4 16.0 13.3 13.1 11.7 POWER AVE POWER MW 96 99 227 204 240 244 258 271 263 242 221 215 117 98 100 93 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1712.6 34.7 16.6 49.0 146.9 178.3 175.8 192.2 201.8 189.2 179.7 79.7 36.1 22.4 73.1 74.3 62.7 --GAVINS POINT-- NAT INFLOW 1500 104 49 62 145 160 175 100 90 95 120 60 28 32 80 85 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 0 1 0 -29 5 -8 -1 -3 -3 2 2 2 0 25 5 0 3 EVAPORATION 36 2 6 9 8 3 2 2 4 REG INFLOW 18660 452 211 514 1583 1882 1874 1943 2054 1965 1968 925 432 306 892 892 767 RELEASE 18660 452 211 514 1583 1882 1874 1943 2041 1940 1968 925 432 306 892 892 805 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 15.2 15.2 15.2 28.8 26.6 30.6 31.5 31.6 33.2 32.6 32.0 31.1 31.1 19.3 14.5 14.5 14.5 POWER AVE POWER MW 53 53 98 91 102 104 105 109 109 108 106 106 68 51 51 51 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 763.4 19.1 8.9 21.1 65.3 76.1 75.2 77.8 80.9 78.3 80.6 38.3 17.9 13.1 38.3 38.3 34.3 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 138 64 83 325 295 150 180 120 105 55 30 14 16 25 25 75 DEPLETION 283 7 3 4 24 37 32 40 39 26 12 7 3 3 14 15 16 REGULATED FLOW AT SIOUX CITY KAF 20077 583 272 592 1884 2140 1992 2083 2122 2019 2011 949 443 319 903 902 864 KCFS 19.6 19.6 33.2 31.7 34.8 33.5 33.9 34.5 33.9 32.7 31.9 31.9 20.1 14.7 14.7 15.6 --TOTAL-- NAT INFLOW 24400 1283 598 769 2500 3295 6145 3210 1260 1080 1135 505 236 269 510 610 995 DEPLETION 2898 13 6 8 126 602 1638 1280 354 -172 -88 -172 -80 -91 -219 -202 -104 CHAN STOR 0 75 0 -29 -23 -52 -15 1 -3 36 46 1 0 25 -38 -27 3 EVAPORATION 1681 105 329 407 350 156 72 82 178 STORAGE 53637 54399 54719 54859 55326 55828 58328 58070 56522 55383 54292 53864 53665 53650 53260 53144 53381 SYSTEM POWER AVE POWER MW 730 732 1001 1000 1235 1284 1346 1394 1262 999 950 985 733 787 911 877 PEAK POW MW 2289 2289 2291 2296 2300 2327 2323 2306 2296 2279 2254 2244 2242 2208 2231 2242 ENERGY GWH 9357.0 262.8 122.9 216.3 720.0 919.0 924.7 1001.6 1037.1 908.5 743.0 341.9 165.5 140.8 585.4 677.9 589.4 DAILY GWH 17.5 17.6 24.0 24.0 29.6 30.8 32.3 33.5 30.3 24.0 22.8 23.6 17.6 18.9 21.9 21.0 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 STUDY NO 14 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB13 2013 2014 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 6100 207 96 124 493 971 1505 676 290 259 346 168 78 89 264 224 310 DEPLETION 513 -17 -8 -10 47 289 540 246 10 -108 -54 -40 -18 -21 -120 -133 -89 EVAPORATION 504 32 98 121 105 47 22 25 54 MOD INFLOW 5083 224 105 134 446 682 965 398 182 246 295 160 75 85 330 357 399 RELEASE 6091 179 83 107 476 492 595 615 615 480 369 179 83 95 553 615 555 STOR CHANGE -1008 46 21 27 -30 190 370 -216 -433 -234 -74 -19 -9 -10 -224 -258 -156 STORAGE 13172 13217 13239 13266 13236 13426 13796 13580 13147 12913 12840 12821 12812 12802 12578 12320 12164 ELEV FTMSL 2226.0 2226.2 2226.3 2226.4 2226.3 2227.3 2229.1 2228.1 2225.8 2224.6 2224.2 2224.1 2224.0 2224.0 2222.8 2221.4 2220.5 DISCH KCFS 11.5 6.0 6.0 6.0 8.0 8.0 10.0 10.0 10.0 8.1 6.0 6.0 6.0 6.0 9.0 10.0 10.0 POWER AVE POWER MW 80 80 80 106 107 133 134 133 107 79 79 79 79 118 130 130 PEAK POW MW 156 157 157 157 157 159 158 156 155 155 155 154 154 153 152 151 ENERGY GWH 974.9 28.7 13.4 17.3 76.6 79.3 96.1 99.4 98.9 76.9 59.1 28.6 13.3 15.2 88.0 96.9 87.0 --GARRISON-- NAT INFLOW 9338 430 200 258 716 1127 2674 1609 513 396 426 168 78 89 152 223 279 DEPLETION 1129 10 5 6 29 124 802 657 114 -110 -18 -124 -58 -66 -109 -81 -52 CHAN STOR 15 56 -20 -20 19 21 -31 -10 EVAPORATION 592 37 115 143 123 55 26 29 63 REG INFLOW 13723 654 279 359 1143 1495 2447 1530 899 863 711 415 194 221 720 909 886 RELEASE 14962 476 222 286 1071 1291 1488 1476 1476 1202 1045 506 236 270 1168 1445 1305 STOR CHANGE -1239 178 57 73 72 204 959 54 -577 -339 -335 -91 -42 -48 -448 -536 -419 STORAGE 16130 16308 16365 16438 16510 16713 17673 17727 17150 16811 16476 16385 16342 16294 15846 15310 14891 ELEV FTMSL 1830.8 1831.4 1831.6 1831.8 1832.1 1832.8 1836.1 1836.2 1834.3 1833.1 1832.0 1831.7 1831.5 1831.3 1829.7 1827.8 1826.3 DISCH KCFS 24.0 16.0 16.0 16.0 18.0 21.0 25.0 24.0 24.0 20.2 17.0 17.0 17.0 17.0 19.0 23.5 23.5 POWER AVE POWER MW 191 192 192 216 252 304 295 293 245 205 204 204 203 226 275 272 PEAK POW MW 446 446 447 448 451 463 464 456 452 448 447 446 446 440 433 427 ENERGY GWH 2173.8 68.8 32.2 41.5 155.6 187.8 218.7 219.4 218.2 176.3 152.5 73.4 34.2 39.1 168.0 204.9 183.0 --OAHE-- NAT INFLOW 1369 214 100 128 190 137 290 147 68 79 16 13 6 7 -95 -10 79 DEPLETION 709 24 11 15 50 73 151 182 122 30 -11 1 0 1 13 18 29 CHAN STOR 2 34 -8 -13 -17 4 17 15 0 -9 -21 0 EVAPORATION 529 34 104 127 109 49 23 26 57 REG INFLOW 15095 700 311 399 1203 1342 1609 1411 1318 1141 978 469 219 250 994 1396 1355 RELEASE 16365 438 317 447 1393 1763 1631 1862 1886 1677 1167 496 266 205 868 1062 887 STOR CHANGE -1270 261 -6 -48 -191 -420 -22 -451 -568 -536 -189 -27 -47 45 126 334 468 STORAGE 16804 17065 17059 17011 16820 16400 16378 15928 15360 14824 14635 14608 14561 14606 14732 15065 15534 ELEV FTMSL 1600.7 1601.6 1601.5 1601.4 1600.7 1599.2 1599.1 1597.5 1595.4 1593.3 1592.5 1592.4 1592.2 1592.4 1592.9 1594.2 1596.0 DISCH KCFS 17.0 14.7 22.8 25.1 23.4 28.7 27.4 30.3 30.7 28.2 19.0 16.7 19.2 12.9 14.1 17.3 16.0 POWER AVE POWER MW 184 285 313 292 354 337 371 372 338 226 198 228 154 168 207 193 PEAK POW MW 677 676 676 672 664 664 656 645 635 631 631 630 631 633 640 648 ENERGY GWH 2410.3 66.3 47.9 67.6 210.0 263.7 243.0 275.8 276.4 243.1 168.4 71.4 38.3 29.6 125.3 154.0 129.7 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 16237 438 317 447 1393 1763 1631 1854 1862 1646 1140 483 260 198 854 1062 887 RELEASE 16237 438 317 447 1393 1763 1631 1854 1862 1646 1140 483 260 198 854 1062 887 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 17.0 14.7 22.8 25.1 23.4 28.7 27.4 30.2 30.3 27.7 18.5 16.2 18.8 12.5 13.9 17.3 16.0 POWER AVE POWER MW 70 107 117 110 134 128 141 142 131 91 82 94 63 70 85 77 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 936.3 25.1 18.0 25.3 78.9 99.8 92.4 105.0 105.4 94.4 67.7 29.5 15.8 12.1 52.1 63.2 51.5 --FORT RANDALL-- NAT INFLOW 480 77 36 46 96 69 133 37 27 -21 -8 -4 -4 -32 -16 43 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 146 10 32 39 31 12 5 5 12 REG INFLOW 16490 514 353 493 1485 1823 1752 1863 1842 1599 1087 462 251 189 807 1043 927 RELEASE 16490 223 219 493 1485 1823 1752 1863 1842 1746 1730 783 367 215 704 693 553 STOR CHANGE 0 291 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 11.0 7.5 15.7 27.6 25.0 29.6 29.4 30.3 30.0 29.3 28.1 26.3 26.4 13.5 11.4 11.3 10.0 POWER AVE POWER MW 62 133 233 211 250 248 255 252 245 226 199 194 99 84 86 80 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1636.2 22.5 22.3 50.3 151.7 185.7 178.5 189.8 187.6 176.6 167.8 71.7 32.6 19.0 62.7 63.9 53.5 --GAVINS POINT-- NAT INFLOW 1318 89 41 53 127 142 152 86 76 81 112 53 25 28 76 76 101 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR 1 7 -16 -23 5 -9 0 -2 1 1 2 3 0 24 4 0 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 17650 319 244 524 1612 1937 1880 1906 1901 1822 1832 830 387 262 769 769 656 RELEASE 17650 319 244 524 1612 1937 1880 1906 1888 1797 1832 830 387 262 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 13.5 10.7 17.6 29.3 27.1 31.5 31.6 31.0 30.7 30.2 29.8 27.9 27.9 16.5 12.5 12.5 12.5 POWER AVE POWER MW 38 61 99 92 104 105 103 103 103 103 98 98 58 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 727.8 13.5 10.2 21.4 66.5 77.7 75.3 76.8 76.6 74.3 76.8 35.2 16.4 11.2 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1095 126 59 76 146 177 94 109 78 63 37 26 12 14 10 21 47 DEPLETION 270 7 3 4 23 36 31 39 37 25 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 18475 438 300 595 1735 2078 1943 1976 1929 1835 1858 850 397 273 766 776 726 KCFS 14.7 21.6 33.3 29.2 33.8 32.7 32.1 31.4 30.8 30.2 28.6 28.6 17.2 12.5 12.6 13.1 --TOTAL-- NAT INFLOW 19700 1143 533 685 1768 2623 4848 2664 1052 878 916 419 196 223 375 518 859 DEPLETION 2815 25 12 15 158 550 1560 1181 308 -161 -69 -151 -70 -80 -190 -178 -94 CHAN STOR 17 97 -16 -23 -24 -22 -37 3 1 38 38 3 0 24 -36 -31 2 EVAPORATION 1944 122 381 472 405 180 83 95 206 STORAGE 51192 51969 52175 52227 52078 52051 53359 52746 51181 49952 48711 48253 48038 47999 47556 47446 47675 SYSTEM POWER AVE POWER MW 625 858 1034 1027 1202 1255 1299 1295 1169 930 860 897 657 711 828 795 PEAK POW MW 2261 2259 2259 2256 2252 2265 2257 2238 2227 2208 2183 2173 2171 2135 2159 2170 ENERGY GWH 8859.2 225.0 144.1 223.4 739.4 894.0 904.0 966.2 963.2 841.7 692.2 309.7 150.6 126.2 529.3 615.9 534.3 DAILY GWH 15.0 20.6 24.8 24.6 28.8 30.1 31.2 31.1 28.1 22.3 20.6 21.5 15.8 17.1 19.9 19.1 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 STUDY NO 15 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB14 2014 2015 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 6345 215 100 129 513 1010 1565 703 301 270 360 175 81 93 275 233 322 DEPLETION 492 -26 -12 -15 23 292 574 248 8 -114 -57 -41 -19 -22 -122 -135 -91 EVAPORATION 487 30 94 117 102 46 22 25 53 MOD INFLOW 5366 241 112 144 490 718 991 425 199 267 315 169 79 90 344 368 413 RELEASE 5686 149 69 89 476 615 536 553 553 418 307 149 69 95 553 553 500 STOR CHANGE -320 92 43 55 14 103 455 -128 -354 -150 8 20 9 -5 -210 -185 -87 STORAGE 12164 12256 12298 12353 12367 12470 12926 12798 12444 12294 12301 12321 12331 12326 12116 11931 11844 ELEV FTMSL 2220.5 2221.0 2221.3 2221.6 2221.6 2222.2 2224.6 2224.0 2222.1 2221.2 2221.3 2221.4 2221.4 2221.4 2220.3 2219.2 2218.7 DISCH KCFS 10.0 5.0 5.0 5.0 8.0 10.0 9.0 9.0 9.0 7.0 5.0 5.0 5.0 6.0 9.0 9.0 9.0 POWER AVE POWER MW 65 65 65 104 130 118 119 118 92 65 65 65 78 117 116 116 PEAK POW MW 151 152 152 152 153 155 154 152 152 152 152 152 152 151 150 149 ENERGY GWH 897.9 23.5 11.0 14.1 75.2 96.8 85.2 88.4 87.9 66.0 48.6 23.5 11.0 15.1 87.1 86.6 78.0 --GARRISON-- NAT INFLOW 9674 445 208 267 741 1167 2771 1667 531 410 442 174 81 93 158 231 289 DEPLETION 1041 5 2 3 24 160 754 658 120 -120 -30 -132 -62 -70 -120 -91 -61 CHAN STOR 10 52 -31 -21 10 20 21 -10 -31 EVAPORATION 575 35 111 138 120 54 25 29 62 REG INFLOW 13755 641 275 353 1162 1601 2563 1527 854 829 680 400 187 219 739 875 850 RELEASE 14148 431 201 259 1131 1568 1369 1353 1353 1069 861 417 194 230 1138 1353 1222 STOR CHANGE -393 209 73 94 31 33 1194 174 -499 -240 -181 -16 -8 -11 -399 -477 -372 STORAGE 14891 15100 15174 15268 15299 15332 16527 16701 16202 15962 15781 15765 15757 15746 15347 14870 14498 ELEV FTMSL 1826.3 1827.0 1827.3 1827.7 1827.8 1827.9 1832.2 1832.8 1831.0 1830.2 1829.5 1829.5 1829.4 1829.4 1827.9 1826.2 1824.8 DISCH KCFS 23.5 14.5 14.5 14.5 19.0 25.5 23.0 22.0 22.0 18.0 14.0 14.0 14.0 14.5 18.5 22.0 22.0 POWER AVE POWER MW 168 169 169 222 297 272 264 263 214 166 166 166 172 217 255 252 PEAK POW MW 430 431 432 432 433 449 451 444 441 439 439 439 438 433 427 421 ENERGY GWH 2013.7 60.7 28.4 36.6 159.6 220.8 195.8 196.7 195.9 154.0 123.6 59.7 27.8 32.9 161.7 189.8 169.7 --OAHE-- NAT INFLOW 1547 242 113 145 214 155 327 167 77 89 18 15 7 8 -107 -12 89 DEPLETION 724 25 12 15 51 75 154 187 125 30 -12 1 0 1 13 19 29 CHAN STOR 6 40 0 -20 -29 11 4 18 18 -2 -19 -16 0 EVAPORATION 524 33 103 126 108 49 23 26 56 REG INFLOW 14453 689 303 389 1274 1619 1553 1304 1202 1021 801 382 178 209 942 1305 1282 RELEASE 14856 425 270 378 1177 1543 1408 1725 1750 1549 1038 433 195 147 878 1063 876 STOR CHANGE -403 264 32 11 97 76 145 -421 -548 -528 -238 -51 -17 62 64 242 406 STORAGE 15534 15797 15830 15841 15938 16014 16159 15737 15190 14661 14424 14373 14356 14418 14482 14725 15131 ELEV FTMSL 1596.0 1597.0 1597.1 1597.2 1597.5 1597.8 1598.3 1596.8 1594.7 1592.6 1591.7 1591.5 1591.4 1591.7 1591.9 1592.9 1594.5 DISCH KCFS 16.0 14.3 19.5 21.2 19.8 25.1 23.7 28.1 28.5 26.0 16.9 14.5 14.1 9.3 14.3 17.3 15.8 POWER AVE POWER MW 174 238 258 242 307 290 342 344 311 201 172 167 110 170 206 189 PEAK POW MW 653 654 654 656 657 660 652 642 632 627 626 626 627 628 633 641 ENERGY GWH 2170.4 62.7 39.9 55.8 174.0 228.1 208.7 254.6 255.7 223.9 149.4 62.1 28.0 21.2 126.2 153.1 127.1 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 14727 425 270 378 1177 1543 1408 1718 1726 1518 1011 420 189 141 864 1063 876 RELEASE 14727 425 270 378 1177 1543 1408 1718 1726 1518 1011 420 189 141 864 1063 876 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 16.0 14.3 19.5 21.2 19.8 25.1 23.7 27.9 28.1 25.5 16.4 14.1 13.6 8.9 14.1 17.3 15.8 POWER AVE POWER MW 68 91 99 93 117 111 131 131 121 81 71 69 45 71 85 76 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 849.8 24.4 15.3 21.4 66.7 87.4 79.7 97.3 97.7 87.0 60.1 25.7 11.6 8.6 52.8 63.2 50.8 --FORT RANDALL-- NAT INFLOW 560 91 42 54 112 81 155 44 31 -25 -10 -4 -5 -37 -19 50 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 146 10 32 39 31 12 5 5 12 REG INFLOW 15060 514 312 431 1285 1615 1551 1734 1710 1472 955 397 179 130 812 1041 923 RELEASE 15060 223 178 431 1285 1615 1551 1734 1710 1618 1598 719 296 156 709 691 549 STOR CHANGE 0 291 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 10.0 7.5 12.8 24.2 21.6 26.3 26.1 28.2 27.8 27.2 26.0 24.2 21.3 9.8 11.5 11.2 9.9 POWER AVE POWER MW 62 108 204 183 222 220 238 234 228 209 183 156 72 85 86 79 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1495.6 22.5 18.2 44.1 131.5 164.9 158.3 176.8 174.4 163.9 155.2 65.9 26.3 13.8 63.2 63.7 53.1 --GAVINS POINT-- NAT INFLOW 1361 91 42 55 131 147 157 89 79 84 115 55 26 29 78 78 105 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 5 -10 -22 5 -9 0 -4 1 1 2 3 5 21 -3 1 3 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 16262 319 210 465 1416 1734 1684 1777 1772 1697 1703 768 322 202 769 769 656 RELEASE 16262 319 210 465 1416 1734 1684 1777 1759 1672 1703 768 322 202 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 10.7 15.2 26.0 23.8 28.2 28.3 28.9 28.6 28.1 27.7 25.8 23.2 12.7 12.5 12.5 12.5 POWER AVE POWER MW 38 53 89 82 96 96 98 98 97 97 90 82 45 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 679.9 13.6 8.9 19.2 58.7 71.4 69.3 73.1 72.7 70.2 72.2 32.6 13.7 8.7 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1212 140 65 84 162 196 104 121 87 69 40 29 14 15 11 23 52 DEPLETION 276 7 3 4 23 36 32 39 38 25 11 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 17198 452 272 544 1555 1894 1756 1859 1808 1716 1732 790 333 214 766 777 731 KCFS 15.2 19.6 30.5 26.1 30.8 29.5 30.2 29.4 28.8 28.2 26.6 24.0 13.5 12.5 12.6 13.2 --TOTAL-- NAT INFLOW 20699 1224 571 734 1873 2756 5079 2791 1106 922 950 438 204 233 378 534 907 DEPLETION 2727 13 6 8 130 591 1550 1189 316 -177 -85 -159 -74 -85 -202 -188 -105 CHAN STOR 15 97 -10 -22 -46 -58 22 0 1 40 41 3 5 9 -53 -16 3 EVAPORATION 1905 119 371 462 398 177 82 94 203 STORAGE 47675 48531 48814 48974 49116 49329 51124 50748 49360 48321 47267 46899 46768 46788 46346 46276 46559 SYSTEM POWER AVE POWER MW 576 724 885 925 1168 1107 1192 1189 1062 819 748 705 522 704 792 756 PEAK POW MW 2216 2216 2218 2220 2222 2243 2237 2219 2209 2191 2167 2158 2157 2121 2144 2155 ENERGY GWH 8107.4 207.3 121.7 191.2 665.8 869.3 797.0 886.8 884.4 765.0 609.1 269.4 118.4 100.3 524.0 589.5 508.3 DAILY GWH 13.8 17.4 21.2 22.2 28.0 26.6 28.6 28.5 25.5 19.6 18.0 16.9 12.5 16.9 19.0 18.2 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 STUDY NO 16 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB15 2015 2016 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB --FORT PECK-- NAT INFLOW 6537 222 103 133 528 1041 1613 724 310 278 370 180 84 96 283 240 332 DEPLETION 496 -26 -12 -16 21 292 577 256 12 -114 -59 -41 -19 -22 -121 -133 -100 EVAPORATION 485 30 93 116 101 46 21 24 53 MOD INFLOW 5556 248 116 149 507 749 1036 438 205 276 328 175 81 93 351 373 432 RELEASE 5625 149 69 89 417 584 536 553 553 415 338 164 76 87 523 553 518 STOR CHANGE -69 99 46 59 90 165 500 -115 -348 -140 -11 11 5 6 -172 -180 -86 STORAGE 11844 11943 11989 12048 12139 12304 12804 12689 12341 12201 12190 12201 12206 12212 12041 11860 11775 ELEV FTMSL 2218.7 2219.3 2219.5 2219.9 2220.4 2221.3 2224.0 2223.4 2221.5 2220.7 2220.7 2220.7 2220.7 2220.8 2219.8 2218.8 2218.3 DISCH KCFS 9.0 5.0 5.0 5.0 7.0 9.5 9.0 9.0 9.0 7.0 5.5 5.5 5.5 5.5 8.5 9.0 9.0 POWER AVE POWER MW 65 65 65 91 123 118 118 118 91 72 72 72 72 110 116 116 PEAK POW MW 150 150 150 151 152 154 154 152 151 151 151 151 151 150 149 149 ENERGY GWH 885.8 23.3 10.9 14.0 65.4 91.9 84.9 88.2 87.7 65.5 53.3 25.8 12.0 13.8 82.1 86.5 80.6 --GARRISON-- NAT INFLOW 9933 457 213 274 761 1198 2845 1711 545 421 454 178 83 95 162 238 297 DEPLETION 1103 1 0 1 15 184 790 694 125 -123 -35 -135 -63 -72 -121 -91 -67 CHAN STOR 0 42 -21 -26 5 21 15 0 0 -31 -5 EVAPORATION 571 35 110 137 119 54 25 29 62 REG INFLOW 13884 647 282 363 1142 1572 2596 1535 863 843 723 423 197 225 713 877 882 RELEASE 13972 417 194 250 1071 1476 1369 1353 1353 1072 861 417 194 222 1107 1353 1265 STOR CHANGE -88 231 88 113 71 96 1227 183 -489 -229 -138 6 3 3 -394 -476 -384 STORAGE 14498 14728 14816 14929 15000 15096 16324 16506 16017 15788 15650 15656 15659 15663 15269 14793 14410 ELEV FTMSL 1824.8 1825.6 1826.0 1826.4 1826.7 1827.0 1831.4 1832.1 1830.4 1829.5 1829.0 1829.1 1829.1 1829.1 1827.7 1825.9 1824.4 DISCH KCFS 22.0 14.0 14.0 14.0 18.0 24.0 23.0 22.0 22.0 18.0 14.0 14.0 14.0 14.0 18.0 22.0 22.0 POWER AVE POWER MW 161 162 162 209 278 270 263 262 213 166 165 165 165 211 255 252 PEAK POW MW 425 426 427 428 430 446 448 442 439 437 437 437 437 432 426 420 ENERGY GWH 1980.4 58.0 27.2 35.0 150.1 206.6 194.7 195.8 195.1 153.6 123.2 59.5 27.8 31.8 157.0 189.5 175.4 --OAHE-- NAT INFLOW 1698 265 124 159 235 170 359 183 85 98 20 17 8 9 -118 -13 98 DEPLETION 736 25 12 15 51 76 157 191 128 31 -12 1 0 1 13 19 29 CHAN STOR 0 36 -18 -27 4 4 18 19 0 -19 -19 EVAPORATION 519 33 101 125 108 49 23 26 56 REG INFLOW 14415 693 307 394 1237 1543 1575 1317 1209 1032 804 383 179 205 901 1302 1334 RELEASE 14505 415 264 370 1161 1530 1385 1680 1707 1390 924 494 162 188 880 1063 893 STOR CHANGE -90 279 42 24 76 13 191 -364 -498 -357 -120 -110 17 17 21 239 442 STORAGE 15131 15409 15452 15476 15552 15565 15755 15391 14893 14536 14415 14305 14322 14339 14360 14599 15041 ELEV FTMSL 1594.5 1595.5 1595.7 1595.8 1596.1 1596.1 1596.8 1595.5 1593.6 1592.1 1591.7 1591.2 1591.3 1591.4 1591.4 1592.4 1594.1 DISCH KCFS 15.8 13.9 19.0 20.7 19.5 24.9 23.3 27.3 27.8 23.4 15.0 16.6 11.7 11.8 14.3 17.3 15.5 POWER AVE POWER MW 169 231 251 237 301 283 331 333 278 178 196 138 140 169 205 186 PEAK POW MW 646 647 647 649 649 652 646 636 629 627 625 625 625 626 631 639 ENERGY GWH 2107.6 60.7 38.7 54.2 170.4 224.3 203.5 246.2 247.8 200.1 132.8 70.7 23.3 26.9 126.1 152.7 129.2 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 14376 415 264 370 1161 1530 1385 1673 1683 1359 897 481 157 181 866 1063 893 RELEASE 14376 415 264 370 1161 1530 1385 1673 1683 1359 897 481 157 181 866 1063 893 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 15.8 13.9 19.0 20.7 19.5 24.9 23.3 27.2 27.4 22.8 14.6 16.2 11.3 11.4 14.1 17.3 15.5 POWER AVE POWER MW 66 89 97 91 116 109 127 128 108 73 82 57 58 71 85 74 PEAK POW MW 517 509 509 509 509 509 509 509 521 538 538 538 538 538 538 529 ENERGY GWH 830.5 23.8 15.0 21.0 65.8 86.7 78.4 94.7 95.3 77.8 54.2 29.3 9.6 11.1 52.8 63.2 51.8 --FORT RANDALL-- NAT INFLOW 627 101 47 61 125 91 174 49 35 -28 -11 -5 -6 -42 -21 56 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 143 10 32 39 29 11 5 5 12 REG INFLOW 14781 515 311 430 1282 1612 1547 1694 1671 1313 839 459 147 170 808 1039 946 RELEASE 14781 223 177 430 1282 1612 1547 1694 1671 1580 1558 699 173 170 705 689 572 STOR CHANGE 0 291 134 0 0 0 0 -267 -719 -240 -26 0 103 350 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3282 2563 2323 2297 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1352.0 1342.0 1338.0 1337.5 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 9.9 7.5 12.7 24.1 21.5 26.2 26.0 27.5 27.2 26.6 25.3 23.5 12.4 10.7 11.5 11.2 9.9 POWER AVE POWER MW 62 108 203 182 221 219 232 229 221 200 174 91 78 84 85 79 PEAK POW MW 351 356 356 356 356 356 356 356 345 305 287 285 285 293 319 339 ENERGY GWH 1463.8 22.5 18.1 43.9 131.2 164.6 157.9 172.8 170.5 159.2 148.5 62.7 15.3 15.0 62.9 63.5 55.3 --GAVINS POINT-- NAT INFLOW 1394 93 44 56 134 150 161 91 81 86 118 57 26 30 80 80 107 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 5 -10 -22 5 -9 0 -3 1 1 2 3 20 3 -1 0 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 16015 322 211 464 1416 1734 1684 1740 1735 1661 1666 750 215 198 769 769 681 RELEASE 16015 322 211 464 1416 1734 1684 1740 1722 1636 1666 750 215 198 769 769 719 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 10.8 15.2 26.0 23.8 28.2 28.3 28.3 28.0 27.5 27.1 25.2 15.5 12.5 12.5 12.5 12.5 POWER AVE POWER MW 38 53 89 82 96 96 96 96 96 95 88 55 44 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 669.9 13.6 8.9 19.2 58.7 71.4 69.3 71.6 71.3 68.8 70.6 31.8 9.2 8.5 33.0 33.0 30.7 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1311 151 70 91 175 212 112 131 94 75 44 31 14 17 13 25 56 DEPLETION 277 7 3 4 23 36 32 40 38 25 11 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 17049 465 278 551 1568 1910 1764 1831 1778 1686 1699 774 227 211 768 779 760 KCFS 15.6 20.0 30.8 26.4 31.1 29.6 29.8 28.9 28.3 27.6 26.0 16.3 13.3 12.5 12.7 13.2 --TOTAL-- NAT INFLOW 21500 1290 602 774 1958 2862 5264 2889 1150 958 978 452 211 241 378 549 946 DEPLETION 2806 8 4 5 119 616 1592 1238 328 -179 -92 -162 -76 -86 -202 -186 -120 CHAN STOR -1 83 -10 -22 -34 -62 10 1 1 40 36 4 21 3 -51 -23 2 EVAPORATION 1892 117 368 459 395 176 82 93 202 STORAGE 46559 47459 47769 47966 48203 48477 50395 50099 48776 47808 46820 46486 46485 46511 46070 46003 46311 SYSTEM POWER AVE POWER MW 561 707 868 891 1136 1096 1168 1166 1007 783 778 579 558 691 791 751 PEAK POW MW 2202 2202 2204 2207 2210 2233 2227 2210 2203 2175 2155 2153 2154 2117 2140 2152 ENERGY GWH 7937.9 201.9 118.8 187.4 641.7 845.3 788.8 869.2 867.6 725.0 582.6 279.9 97.2 107.1 514.0 588.4 523.0 DAILY GWH 13.5 17.0 20.8 21.4 27.3 26.3 28.0 28.0 24.2 18.8 18.7 13.9 13.4 16.6 19.0 18.0 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 STUDY NO 17 VALUES IN 1000 AF EXCEPT AS INDICATED 29FEB16 2016 2017 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 6841 232 108 139 553 1089 1687 758 325 291 388 188 88 100 296 251 348 DEPLETION 510 -25 -12 -15 21 293 581 262 16 -114 -61 -42 -20 -22 -124 -136 -92 EVAPORATION 488 30 93 117 102 46 22 25 53 MOD INFLOW 5843 257 120 154 532 796 1106 466 216 288 347 184 86 98 367 387 440 RELEASE 5658 149 69 89 417 615 536 553 553 421 307 149 69 95 523 584 528 STOR CHANGE 186 108 50 65 115 181 570 -87 -338 -133 40 35 16 3 -156 -197 -88 STORAGE 11775 11883 11933 11998 12114 12295 12865 12778 12440 12307 12347 12382 12398 12401 12245 12048 11960 ELEV FTMSL 2218.3 2219.0 2219.2 2219.6 2220.2 2221.2 2224.3 2223.9 2222.0 2221.3 2221.5 2221.7 2221.8 2221.8 2221.0 2219.9 2219.4 DISCH KCFS 9.0 5.0 5.0 5.0 7.0 10.0 9.0 9.0 9.0 7.1 5.0 5.0 5.0 6.0 8.5 9.5 9.5 POWER AVE POWER MW 65 65 65 91 129 118 119 118 92 65 65 65 79 111 123 123 PEAK POW MW 149 150 150 151 152 155 154 152 152 152 152 152 152 151 150 150 ENERGY GWH 892.4 23.3 10.9 14.0 65.4 96.3 85.0 88.3 87.9 66.6 48.6 23.6 11.0 15.1 82.4 91.7 82.5 --GARRISON-- NAT INFLOW 10335 476 222 285 792 1247 2960 1780 567 438 472 186 87 99 169 247 309 DEPLETION 1124 2 1 1 17 185 800 710 130 -126 -39 -140 -65 -74 -123 -92 -63 CHAN STOR -5 42 -21 -31 10 20 21 -10 -26 -10 EVAPORATION 575 35 111 138 120 54 25 29 62 REG INFLOW 14289 665 290 373 1171 1646 2706 1588 880 866 719 420 196 229 727 913 900 RELEASE 14059 417 194 250 1041 1568 1369 1353 1353 1078 861 417 194 222 1168 1353 1222 STOR CHANGE 230 248 96 123 129 78 1337 236 -473 -211 -141 3 1 7 -442 -440 -322 STORAGE 14410 14658 14754 14877 15006 15084 16422 16657 16184 15973 15831 15834 15836 15843 15402 14962 14639 ELEV FTMSL 1824.4 1825.4 1825.7 1826.2 1826.7 1827.0 1831.8 1832.6 1830.9 1830.2 1829.7 1829.7 1829.7 1829.7 1828.1 1826.5 1825.3 DISCH KCFS 22.0 14.0 14.0 14.0 17.5 25.5 23.0 22.0 22.0 18.1 14.0 14.0 14.0 14.0 19.0 22.0 22.0 POWER AVE POWER MW 161 162 162 203 295 271 264 263 215 166 166 166 166 224 256 253 PEAK POW MW 424 425 427 429 430 447 450 444 441 439 440 440 440 434 428 423 ENERGY GWH 1997.4 57.9 27.1 35.0 145.9 219.3 194.9 196.3 195.8 155.1 123.7 59.8 27.9 31.9 166.3 190.2 170.2 --OAHE-- NAT INFLOW 1957 306 143 183 271 195 414 211 98 113 23 19 9 10 -135 -15 113 DEPLETION 752 25 12 15 52 77 160 195 132 32 -12 1 0 1 13 19 30 CHAN STOR 0 36 -16 -36 11 4 18 19 0 -23 -14 0 EVAPORATION 525 33 102 126 109 49 23 26 57 REG INFLOW 14739 734 325 418 1245 1650 1634 1340 1216 1050 806 385 180 205 940 1305 1305 RELEASE 14504 396 254 357 1132 1532 1345 1688 1718 1526 1021 420 164 148 886 1064 854 STOR CHANGE 235 338 71 62 112 118 289 -347 -501 -476 -215 -35 16 57 54 241 451 STORAGE 15041 15378 15449 15511 15623 15741 16030 15683 15182 14706 14491 14456 14472 14530 14583 14824 15275 ELEV FTMSL 1594.1 1595.4 1595.7 1595.9 1596.4 1596.8 1597.9 1596.6 1594.7 1592.8 1592.0 1591.8 1591.9 1592.1 1592.3 1593.3 1595.0 DISCH KCFS 15.5 13.3 18.3 20.0 19.0 24.9 22.6 27.4 27.9 25.6 16.6 14.1 11.8 9.3 14.4 17.3 15.4 POWER AVE POWER MW 161 222 242 231 303 276 334 337 307 198 168 140 111 172 206 185 PEAK POW MW 645 647 648 650 652 658 651 642 633 628 628 628 629 630 635 644 ENERGY GWH 2115.5 57.9 37.3 52.3 166.3 225.2 198.6 248.6 250.8 220.7 147.0 60.4 23.5 21.4 127.7 153.6 124.2 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 14376 396 254 357 1132 1532 1345 1680 1693 1495 994 408 158 142 872 1064 854 RELEASE 14376 396 254 357 1132 1532 1345 1680 1693 1495 994 408 158 142 872 1064 854 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 15.5 13.3 18.3 20.0 19.0 24.9 22.6 27.3 27.5 25.1 16.2 13.7 11.4 8.9 14.2 17.3 15.4 POWER AVE POWER MW 63 86 94 89 117 106 128 129 119 79 69 58 45 72 85 74 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 829.7 22.7 14.4 20.2 64.1 86.8 76.2 95.1 95.9 85.7 59.1 24.9 9.7 8.7 53.3 63.3 49.6 --FORT RANDALL-- NAT INFLOW 744 120 56 72 149 108 207 58 41 -33 -13 -6 -7 -50 -25 66 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 146 10 32 39 31 12 5 5 12 REG INFLOW 14892 515 310 428 1277 1631 1540 1710 1688 1449 929 382 147 129 807 1036 917 RELEASE 14892 223 176 428 1277 1631 1540 1710 1688 1595 1572 703 263 155 704 686 543 STOR CHANGE 0 291 134 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 9.9 7.5 12.7 24.0 21.5 26.5 25.9 27.8 27.4 26.8 25.6 23.6 18.9 9.8 11.4 11.2 9.8 POWER AVE POWER MW 62 107 202 182 224 218 234 231 224 205 179 139 72 84 85 78 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1479.6 22.5 18.0 43.7 130.7 166.5 157.2 174.4 172.1 161.6 152.7 64.5 23.4 13.8 62.7 63.2 52.5 --GAVINS POINT-- NAT INFLOW 1444 97 45 58 139 156 167 94 83 89 122 59 27 31 83 83 111 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 5 -10 -22 5 -10 1 -4 1 1 2 4 9 17 -3 1 3 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 16177 325 211 464 1416 1759 1684 1759 1753 1679 1685 756 294 198 769 769 656 RELEASE 16177 325 211 464 1416 1759 1684 1759 1740 1654 1685 756 294 198 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 10.9 15.2 26.0 23.8 28.6 28.3 28.6 28.3 27.8 27.4 25.4 21.2 12.5 12.5 12.5 12.5 POWER AVE POWER MW 38 53 89 82 97 96 97 97 96 96 89 75 44 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 676.4 13.8 8.9 19.2 58.7 72.4 69.3 72.4 72.0 69.5 71.4 32.1 12.5 8.5 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1479 170 79 102 197 240 127 148 106 85 49 35 16 19 14 28 63 DEPLETION 280 7 3 4 24 37 32 40 38 25 12 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 17376 488 287 562 1589 1962 1779 1867 1808 1714 1722 784 308 214 769 782 742 KCFS 16.4 20.7 31.5 26.7 31.9 29.9 30.4 29.4 28.8 28.0 26.4 22.2 13.5 12.5 12.7 13.4 --TOTAL-- NAT INFLOW 22800 1401 653 840 2101 3035 5562 3049 1220 1016 1021 473 221 252 377 569 1010 DEPLETION 2860 10 5 6 123 620 1609 1264 341 -181 -97 -168 -78 -90 -207 -190 -107 CHAN STOR -7 83 -10 -22 -32 -77 23 1 1 38 43 3 9 7 -53 -24 3 EVAPORATION 1907 118 371 462 398 178 82 94 204 STORAGE 46311 47297 47648 47898 48255 48632 50829 50630 49331 48390 47430 47112 47030 47072 46631 46584 46962 SYSTEM POWER AVE POWER MW 550 694 854 877 1165 1085 1176 1175 1054 810 737 643 517 706 800 757 PEAK POW MW 2200 2201 2204 2209 2213 2239 2235 2219 2210 2194 2170 2162 2161 2125 2148 2161 ENERGY GWH 7991.0 198.0 116.6 184.4 631.3 866.4 781.2 875.2 874.5 759.2 602.7 265.2 108.1 99.3 525.4 595.0 508.6 DAILY GWH 13.2 16.7 20.5 21.0 27.9 26.0 28.2 28.2 25.3 19.4 17.7 15.4 12.4 16.9 19.2 18.2 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER QUARTILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:06 STUDY NO 18 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB17 2017 2018 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 7200 244 114 146 582 1146 1776 798 342 306 408 198 92 106 312 264 366 DEPLETION 521 -26 -12 -16 21 293 585 269 21 -114 -62 -43 -20 -23 -125 -136 -92 EVAPORATION 497 31 96 119 104 47 22 25 54 MOD INFLOW 6182 270 126 162 561 853 1191 498 225 301 366 194 90 103 383 400 458 RELEASE 5771 149 69 89 357 615 565 584 584 456 369 179 83 95 523 553 500 STOR CHANGE 411 121 57 73 204 238 626 -86 -359 -155 -3 15 7 8 -140 -153 -42 STORAGE 11960 12082 12138 12211 12415 12653 13279 13193 12834 12679 12677 12692 12699 12707 12567 12414 12372 ELEV FTMSL 2219.4 2220.1 2220.4 2220.8 2221.9 2223.2 2226.5 2226.1 2224.2 2223.3 2223.3 2223.4 2223.4 2223.5 2222.7 2221.9 2221.7 DISCH KCFS 9.5 5.0 5.0 5.0 6.0 10.0 9.5 9.5 9.5 7.7 6.0 6.0 6.0 6.0 8.5 9.0 9.0 POWER AVE POWER MW 65 65 65 78 131 126 126 126 101 79 79 79 79 112 118 117 PEAK POW MW 150 151 151 152 154 157 156 155 154 154 154 154 154 153 152 152 ENERGY GWH 918.0 23.4 10.9 14.1 56.4 97.1 90.5 94.0 93.6 72.7 58.8 28.5 13.3 15.2 83.1 87.6 79.0 --GARRISON-- NAT INFLOW 10800 497 232 298 828 1303 3093 1861 593 458 493 194 90 103 176 258 323 DEPLETION 1114 1 1 1 17 184 810 726 136 -129 -44 -143 -67 -76 -132 -101 -70 CHAN STOR 5 47 -10 -41 5 19 17 -25 -5 EVAPORATION 586 36 113 141 122 55 26 30 64 REG INFLOW 14876 691 301 386 1158 1693 2853 1683 928 921 801 460 215 245 742 907 893 RELEASE 14372 417 194 250 1012 1476 1428 1414 1414 1213 861 417 194 222 1168 1414 1277 STOR CHANGE 504 275 106 137 146 217 1425 269 -486 -292 -60 43 20 23 -427 -507 -385 STORAGE 14639 14914 15020 15157 15303 15520 16945 17214 16728 16436 16376 16419 16439 16462 16035 15528 15144 ELEV FTMSL 1825.3 1826.3 1826.7 1827.2 1827.8 1828.6 1833.6 1834.5 1832.8 1831.8 1831.6 1831.8 1831.8 1831.9 1830.4 1828.6 1827.2 DISCH KCFS 22.0 14.0 14.0 14.0 17.0 24.0 24.0 23.0 23.0 20.4 14.0 14.0 14.0 14.0 19.0 23.0 23.0 POWER AVE POWER MW 162 163 163 198 280 286 279 278 245 168 168 168 168 227 271 268 PEAK POW MW 427 429 431 433 435 454 457 451 447 447 447 447 448 442 435 430 ENERGY GWH 2065.6 58.3 27.3 35.2 142.8 208.4 205.6 207.6 207.1 176.4 125.2 60.6 28.3 32.3 168.7 201.6 180.2 --OAHE-- NAT INFLOW 2300 360 168 216 318 230 486 248 115 133 27 22 10 12 -159 -18 133 DEPLETION 765 25 12 15 52 78 163 200 135 32 -13 1 0 1 14 20 30 CHAN STOR -4 36 -13 -31 4 12 29 0 -23 -18 EVAPORATION 540 34 106 130 112 50 23 27 58 REG INFLOW 15363 787 350 450 1264 1597 1751 1432 1288 1196 818 387 181 207 915 1358 1380 RELEASE 14845 368 241 339 1096 1536 1295 1760 1792 1606 1109 465 252 198 886 1065 836 STOR CHANGE 518 419 110 111 168 61 456 -328 -503 -410 -291 -78 -71 9 29 293 545 STORAGE 15275 15695 15804 15915 16083 16144 16601 16273 15770 15359 15068 14990 14919 14928 14956 15249 15794 ELEV FTMSL 1595.0 1596.6 1597.0 1597.4 1598.1 1598.3 1599.9 1598.8 1596.9 1595.4 1594.2 1593.9 1593.7 1593.7 1593.8 1594.9 1597.0 DISCH KCFS 15.4 12.4 17.3 19.0 18.4 25.0 21.8 28.6 29.1 27.0 18.0 15.6 18.2 12.5 14.4 17.3 15.0 POWER AVE POWER MW 150 212 232 226 306 268 353 356 327 217 188 218 150 173 208 183 PEAK POW MW 651 653 655 658 660 668 662 653 645 640 638 637 637 637 643 653 ENERGY GWH 2187.0 54.1 35.5 50.1 162.5 227.7 193.2 262.4 264.7 235.3 161.8 67.7 36.6 28.7 128.7 155.1 122.8 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 14716 368 241 339 1096 1536 1295 1753 1767 1575 1082 453 246 191 872 1065 836 RELEASE 14716 368 241 339 1096 1536 1295 1753 1767 1575 1082 453 246 191 872 1065 836 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 15.4 12.4 17.3 19.0 18.4 25.0 21.8 28.5 28.7 26.5 17.6 15.2 17.7 12.1 14.2 17.3 15.0 POWER AVE POWER MW 59 81 89 86 117 102 133 135 125 86 77 89 61 72 85 72 PEAK POW MW 517 509 509 509 509 509 509 509 517 538 538 538 538 538 538 529 ENERGY GWH 849.8 21.1 13.6 19.2 62.1 87.0 73.3 99.3 100.1 90.3 64.3 27.6 15.0 11.7 53.2 63.4 48.5 --FORT RANDALL-- NAT INFLOW 900 145 68 87 180 130 250 70 50 -40 -15 -7 -8 -60 -30 80 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 146 10 32 39 31 12 5 5 12 REG INFLOW 15389 512 308 426 1272 1657 1533 1795 1771 1529 1010 425 234 178 797 1032 913 RELEASE 15389 220 174 426 1272 1657 1533 1795 1771 1675 1653 746 350 204 694 682 539 STOR CHANGE 0 291 134 0 0 0 0 -146 -643 -321 -116 -26 103 350 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3403 2760 2439 2323 2297 2400 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1353.5 1345.0 1340.0 1338.0 1337.5 1339.3 1344.8 1350.0 DISCH KCFS 9.8 7.4 12.5 23.8 21.4 26.9 25.8 29.2 28.8 28.1 26.9 25.1 25.2 12.8 11.3 11.1 9.7 POWER AVE POWER MW 62 106 201 181 227 217 246 243 236 216 190 185 94 83 85 78 PEAK POW MW 351 356 356 356 356 356 356 356 350 319 296 287 285 293 319 339 ENERGY GWH 1527.0 22.2 17.8 43.5 130.2 169.1 156.5 182.9 180.5 169.6 160.5 68.3 31.0 18.0 61.9 62.9 52.1 --GAVINS POINT-- NAT INFLOW 1500 101 47 60 144 162 173 98 86 92 127 61 28 32 87 87 115 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 5 -10 -22 5 -11 2 -7 1 1 2 3 0 23 3 0 3 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 16729 326 211 464 1416 1789 1684 1845 1839 1763 1771 800 373 254 769 769 656 RELEASE 16729 326 211 464 1416 1789 1684 1845 1826 1738 1771 800 373 254 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 11.0 15.2 26.0 23.8 29.1 28.3 30.0 29.7 29.2 28.8 26.9 26.9 16.0 12.5 12.5 12.5 POWER AVE POWER MW 38 53 89 82 99 96 101 101 101 101 94 94 57 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 697.3 13.8 8.9 19.2 58.7 73.5 69.3 75.1 74.9 72.6 74.9 33.9 15.8 10.9 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1700 196 91 118 227 275 146 170 121 97 57 41 19 22 16 32 73 DEPLETION 283 7 3 4 24 37 32 40 39 26 12 7 3 3 14 15 16 REGULATED FLOW AT SIOUX CITY KAF 18146 515 299 578 1619 2027 1798 1975 1908 1809 1816 834 389 272 771 786 751 KCFS 17.3 21.6 32.4 27.2 33.0 30.2 32.1 31.0 30.4 29.5 28.0 28.0 17.1 12.5 12.8 13.5 --TOTAL-- NAT INFLOW 24400 1543 719 925 2279 3246 5924 3245 1307 1086 1072 500 233 266 372 593 1090 DEPLETION 2877 9 4 5 123 620 1626 1292 356 -183 -104 -172 -80 -92 -216 -198 -113 CHAN STOR 0 88 -10 -22 -19 -83 7 -2 1 31 48 3 0 23 -46 -23 3 EVAPORATION 1942 121 379 471 405 181 84 95 207 STORAGE 46962 48069 48475 48795 49313 49829 52337 52192 50857 49878 48881 48540 48380 48394 47959 47941 48396 SYSTEM POWER AVE POWER MW 535 679 840 851 1160 1095 1238 1238 1135 868 796 833 609 711 811 762 PEAK POW MW 2211 2212 2217 2223 2228 2258 2255 2239 2231 2214 2190 2180 2178 2142 2166 2179 ENERGY GWH 8244.7 192.8 114.1 181.4 612.9 862.8 788.4 921.2 920.9 816.9 645.5 286.6 140.0 116.9 528.6 603.6 512.2 DAILY GWH 12.9 16.3 20.2 20.4 27.8 26.3 29.7 29.7 27.2 20.8 19.1 20.0 14.6 17.1 19.5 18.3 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:29 STUDY NO 19 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB13 2013 2014 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 5527 198 93 119 481 865 1223 624 276 251 328 161 75 86 235 215 297 DEPLETION 537 -6 -3 -4 56 215 387 297 68 -54 -43 -33 -15 -17 -107 -119 -85 EVAPORATION 481 30 93 116 100 45 21 24 52 MOD INFLOW 4509 205 95 123 425 650 836 297 115 189 271 148 69 79 290 334 382 RELEASE 5816 179 83 107 417 553 536 553 553 443 369 179 83 95 553 584 528 STOR CHANGE -1307 26 12 16 8 97 300 -256 -438 -254 -98 -30 -14 -16 -263 -250 -146 STORAGE 12493 12519 12531 12547 12556 12652 12953 12696 12258 12004 11906 11875 11861 11845 11582 11332 11186 ELEV FTMSL 2222.3 2222.5 2222.5 2222.6 2222.7 2223.2 2224.8 2223.4 2221.0 2219.6 2219.1 2218.9 2218.8 2218.7 2217.3 2215.8 2215.0 DISCH KCFS 12.0 6.0 6.0 6.0 7.0 9.0 9.0 9.0 9.0 7.5 6.0 6.0 6.0 6.0 9.0 9.5 9.5 POWER AVE POWER MW 79 79 79 92 118 119 119 118 97 78 78 78 77 116 121 120 PEAK POW MW 153 153 153 153 154 155 154 151 150 149 149 149 149 147 146 145 ENERGY GWH 914.1 28.3 13.2 17.0 66.1 87.9 85.4 88.3 87.6 69.7 57.8 27.9 13.0 14.9 86.0 90.1 80.9 --GARRISON-- NAT INFLOW 7739 382 178 229 601 1103 2306 1129 377 167 408 155 72 82 141 141 267 DEPLETION 1234 23 11 14 16 100 782 669 158 -114 -21 -114 -53 -61 -86 -56 -33 CHAN STOR 26 62 -10 -21 16 15 -31 -5 EVAPORATION 559 35 109 134 116 52 24 28 60 REG INFLOW 11788 600 251 323 991 1536 2060 978 664 606 697 395 184 211 689 776 828 RELEASE 13392 417 194 250 952 1353 1309 1291 1291 1045 861 417 194 222 1138 1291 1166 STOR CHANGE -1604 184 57 73 39 183 750 -313 -628 -440 -164 -22 -10 -12 -448 -515 -339 STORAGE 15295 15479 15535 15608 15647 15830 16581 16268 15640 15201 15037 15015 15005 14993 14545 14030 13691 ELEV FTMSL 1827.8 1828.4 1828.6 1828.9 1829.0 1829.7 1832.3 1831.2 1829.0 1827.4 1826.8 1826.7 1826.7 1826.6 1824.9 1823.0 1821.6 DISCH KCFS 22.5 14.0 14.0 14.0 16.0 22.0 22.0 21.0 21.0 17.6 14.0 14.0 14.0 14.0 18.5 21.0 21.0 POWER AVE POWER MW 164 165 165 189 259 262 251 249 206 163 163 163 163 213 239 236 PEAK POW MW 435 436 437 437 440 449 445 437 431 429 429 428 428 422 415 410 ENERGY GWH 1893.3 59.1 27.7 35.6 135.8 192.7 188.6 187.0 185.0 148.2 121.4 58.6 27.3 31.2 158.6 177.6 158.6 --OAHE-- NAT INFLOW 1181 201 94 121 175 118 262 128 51 67 5 8 4 4 -103 -20 67 DEPLETION 709 24 11 15 50 73 151 182 122 30 -11 1 0 1 13 18 29 CHAN STOR 6 37 -9 -26 4 16 17 0 -22 -12 EVAPORATION 507 32 99 122 105 47 22 25 55 REG INFLOW 13363 631 277 356 1068 1371 1420 1210 1121 976 789 376 175 201 945 1241 1204 RELEASE 15008 457 289 403 1243 1606 1485 1717 1748 1421 950 508 188 154 919 1022 897 STOR CHANGE -1645 175 -12 -47 -174 -234 -65 -508 -626 -445 -161 -132 -13 47 26 219 308 STORAGE 15949 16124 16112 16065 15890 15656 15591 15083 14456 14011 13850 13718 13705 13751 13777 13997 14304 ELEV FTMSL 1597.6 1598.2 1598.2 1598.0 1597.3 1596.5 1596.2 1594.3 1591.8 1590.0 1589.4 1588.8 1588.8 1589.0 1589.1 1590.0 1591.2 DISCH KCFS 16.2 15.3 20.8 22.6 20.9 26.1 25.0 27.9 28.4 23.9 15.5 17.1 13.6 9.7 15.0 16.6 16.1 POWER AVE POWER MW 188 255 277 256 318 303 336 338 281 181 200 159 113 175 195 190 PEAK POW MW 659 659 658 655 651 649 640 628 619 616 613 613 614 614 619 625 ENERGY GWH 2171.0 67.8 42.9 59.8 184.0 236.3 218.0 250.3 251.6 202.5 134.8 71.8 26.6 21.8 130.0 144.8 127.9 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 14879 457 289 403 1243 1606 1485 1710 1723 1391 923 496 183 147 905 1022 897 RELEASE 14879 457 289 403 1243 1606 1485 1710 1723 1391 923 496 183 147 905 1022 897 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 16.2 15.3 20.8 22.6 20.9 26.1 25.0 27.8 28.0 23.4 15.0 16.7 13.2 9.3 14.7 16.6 16.1 POWER AVE POWER MW 73 97 106 98 122 117 130 131 111 75 84 66 47 74 82 77 PEAK POW MW 517 509 509 509 509 509 509 509 521 538 538 538 538 538 538 529 ENERGY GWH 859.0 26.2 16.4 22.8 70.4 90.9 84.1 96.8 97.6 79.6 55.7 30.2 11.2 9.0 55.2 60.8 52.1 --FORT RANDALL-- NAT INFLOW 368 71 33 43 90 63 121 26 16 -11 -32 -13 -6 -7 -42 -21 37 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 143 10 32 39 29 11 5 5 12 REG INFLOW 15024 526 321 445 1329 1660 1594 1708 1692 1334 861 471 172 135 848 998 931 RELEASE 15024 235 187 445 1329 1660 1594 1708 1692 1601 1580 710 199 108 722 698 557 STOR CHANGE 0 291 134 0 0 0 0 -267 -719 -239 -27 27 126 300 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 3282 2563 2324 2297 2324 2450 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1352.0 1342.0 1338.0 1337.5 1338.0 1340.2 1344.8 1350.0 DISCH KCFS 10.1 7.9 13.5 24.9 22.3 27.0 26.8 27.8 27.5 26.9 25.7 23.9 14.3 6.8 11.7 11.3 10.0 POWER AVE POWER MW 66 114 210 189 228 226 234 232 224 202 177 105 50 87 87 80 PEAK POW MW 351 356 356 356 356 356 356 356 345 305 287 285 287 297 319 339 ENERGY GWH 1488.9 23.6 19.2 45.4 136.0 169.3 162.7 174.2 172.6 161.2 150.6 63.7 17.6 9.6 64.7 64.6 53.8 --GAVINS POINT-- NAT INFLOW 1223 84 39 50 117 133 143 82 66 71 102 49 23 26 71 71 97 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 4 -11 -22 5 -9 0 -2 0 1 2 3 18 14 -9 1 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 16088 323 216 473 1446 1765 1714 1746 1741 1667 1672 753 235 143 769 769 656 RELEASE 16088 323 216 473 1446 1765 1714 1746 1728 1642 1672 753 235 143 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 10.9 15.6 26.5 24.3 28.7 28.8 28.4 28.1 27.6 27.2 25.3 16.9 9.0 12.5 12.5 12.5 POWER AVE POWER MW 38 54 91 83 98 98 97 96 96 95 89 60 32 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 672.5 13.7 9.1 19.5 59.9 72.6 70.5 71.9 71.5 69.0 70.9 32.0 10.0 6.2 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 762 95 44 57 98 131 71 76 44 38 27 19 9 10 5 16 22 DEPLETION 270 7 3 4 23 36 31 39 37 25 11 6 3 3 13 14 15 REGULATED FLOW AT SIOUX CITY KAF 16580 411 257 526 1521 1860 1754 1783 1735 1655 1688 766 241 150 761 771 701 KCFS 13.8 18.5 29.5 25.6 30.2 29.5 29.0 28.2 27.8 27.5 25.7 17.3 9.4 12.4 12.5 12.6 --TOTAL-- NAT INFLOW 16800 1032 481 619 1562 2413 4126 2065 830 583 838 378 176 201 307 402 787 DEPLETION 2944 48 23 29 154 452 1387 1244 410 -111 -61 -134 -62 -71 -154 -139 -71 CHAN STOR 32 104 -11 -22 -14 -56 0 3 0 33 34 4 18 14 -62 -16 2 EVAPORATION 1863 117 365 452 387 172 80 91 198 STORAGE 48824 49499 49690 49732 49605 49650 50636 49559 47880 46499 45356 44933 44869 44914 44355 44109 44268 SYSTEM POWER AVE POWER MW 608 765 927 906 1142 1124 1167 1164 1014 795 790 630 483 709 767 748 PEAK POW MW 2229 2227 2227 2225 2223 2234 2218 2196 2183 2154 2133 2130 2133 2097 2114 2123 ENERGY GWH 7998.9 218.9 128.4 200.3 652.2 849.8 809.3 868.5 865.9 730.2 591.3 284.2 105.8 92.7 527.6 570.9 502.9 DAILY GWH 14.6 18.3 22.3 21.7 27.4 27.0 28.0 27.9 24.3 19.1 18.9 15.1 11.6 17.0 18.4 18.0 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:29 STUDY NO 20 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB14 2014 2015 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 5589 200 93 120 486 875 1237 631 280 254 331 163 76 87 238 217 300 DEPLETION 517 -24 -11 -15 72 299 503 261 28 -96 -80 -39 -18 -21 -118 -130 -95 EVAPORATION 451 28 87 108 94 42 20 23 49 MOD INFLOW 4621 225 105 135 414 576 734 342 165 242 317 159 74 85 307 347 395 RELEASE 5507 149 69 89 387 523 536 553 553 429 338 164 76 95 492 553 500 STOR CHANGE -886 76 35 45 27 53 198 -211 -388 -187 -21 -5 -2 -10 -185 -206 -105 STORAGE 11186 11262 11297 11343 11370 11423 11622 11410 11022 10835 10814 10809 10807 10796 10612 10405 10300 ELEV FTMSL 2215.0 2215.4 2215.6 2215.9 2216.1 2216.4 2217.5 2216.3 2214.0 2212.9 2212.8 2212.8 2212.8 2212.7 2211.6 2210.3 2209.7 DISCH KCFS 9.5 5.0 5.0 5.0 6.5 8.5 9.0 9.0 9.0 7.2 5.5 5.5 5.5 6.0 8.0 9.0 9.0 POWER AVE POWER MW 64 64 64 83 108 115 115 114 91 69 69 69 75 100 112 111 PEAK POW MW 145 146 146 146 146 148 146 144 142 142 142 142 142 141 139 139 ENERGY GWH 840.4 22.9 10.7 13.8 59.6 80.5 82.8 85.5 84.8 65.3 51.4 24.9 11.6 14.5 74.3 83.1 74.7 --GARRISON-- NAT INFLOW 7910 391 182 234 615 1128 2357 1154 385 171 417 158 74 84 144 144 273 DEPLETION 1084 15 7 9 33 170 757 637 122 -122 -31 -130 -61 -69 -113 -83 -57 CHAN STOR 5 48 -16 -21 -5 19 18 0 -5 -21 -11 EVAPORATION 520 32 100 125 108 49 23 26 56 REG INFLOW 11819 572 245 314 953 1459 2130 1038 716 617 696 402 188 217 671 770 830 RELEASE 12906 357 167 214 1190 1537 1309 1230 1230 951 738 357 167 190 1045 1168 1055 STOR CHANGE -1087 215 78 100 -237 -78 821 -192 -514 -335 -42 45 21 27 -374 -399 -225 STORAGE 13691 13906 13984 14085 13847 13770 14591 14399 13886 13551 13509 13555 13576 13602 13228 12830 12604 ELEV FTMSL 1821.6 1822.5 1822.8 1823.2 1822.3 1822.0 1825.1 1824.4 1822.4 1821.1 1820.9 1821.1 1821.2 1821.3 1819.8 1818.2 1817.3 DISCH KCFS 21.0 12.0 12.0 12.0 20.0 25.0 22.0 20.0 20.0 16.0 12.0 12.0 12.0 12.0 17.0 19.0 19.0 POWER AVE POWER MW 135 136 136 226 280 249 229 227 180 134 134 135 135 189 209 207 PEAK POW MW 413 414 416 412 411 423 420 413 408 407 408 408 409 403 397 394 ENERGY GWH 1751.5 48.8 22.8 29.4 162.4 208.3 179.4 170.1 168.6 129.3 100.0 48.4 22.6 25.9 140.8 155.5 139.2 --OAHE-- NAT INFLOW 1196 204 95 122 177 119 265 130 52 68 5 8 4 4 -104 -21 68 DEPLETION 724 25 12 15 51 75 154 187 125 30 -12 1 0 1 13 19 29 CHAN STOR 9 42 -37 -23 14 9 20 20 -25 -10 EVAPORATION 479 30 93 115 99 45 21 24 52 REG INFLOW 12908 578 250 322 1279 1558 1434 1152 1064 894 675 319 149 170 852 1118 1094 RELEASE 14023 452 260 395 1210 1553 1452 1711 1740 1032 852 236 126 141 945 1022 896 STOR CHANGE -1115 127 -10 -73 69 5 -18 -559 -676 -138 -176 83 23 29 -93 96 198 STORAGE 14304 14431 14421 14347 14416 14421 14403 13843 13167 13029 12853 12936 12959 12987 12894 12991 13189 ELEV FTMSL 1591.2 1591.7 1591.7 1591.4 1591.7 1591.7 1591.6 1589.3 1586.5 1585.9 1585.2 1585.5 1585.6 1585.7 1585.3 1585.8 1586.6 DISCH KCFS 16.1 15.2 18.7 22.1 20.3 25.3 24.4 27.8 28.3 17.3 13.8 7.9 9.1 8.9 15.4 16.6 16.1 POWER AVE POWER MW 180 222 262 241 298 288 326 327 199 159 91 104 102 176 190 185 PEAK POW MW 627 627 626 627 627 627 615 601 598 593 595 596 597 594 597 601 ENERGY GWH 1976.1 64.8 37.3 56.5 173.2 222.1 207.7 242.8 243.3 143.5 118.1 32.8 17.5 19.7 130.9 141.5 124.6 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 13895 452 260 395 1210 1553 1452 1703 1716 1001 825 224 120 135 930 1022 896 RELEASE 13895 452 260 395 1210 1553 1452 1703 1716 1001 825 224 120 135 930 1022 896 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 16.1 15.2 18.7 22.1 20.3 25.3 24.4 27.7 27.9 16.8 13.4 7.5 8.7 8.5 15.1 16.6 16.1 POWER AVE POWER MW 72 88 104 95 118 114 130 131 82 68 38 44 43 76 82 77 PEAK POW MW 517 509 509 509 509 509 509 509 538 538 538 538 538 538 538 529 ENERGY GWH 803.8 25.9 14.7 22.4 68.5 88.0 82.3 96.5 97.2 59.1 50.4 13.7 7.4 8.3 56.7 60.8 52.0 --FORT RANDALL-- NAT INFLOW 378 73 34 44 92 65 124 27 16 -11 -32 -14 -6 -7 -43 -22 38 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 137 10 32 37 26 10 5 5 12 REG INFLOW 14055 523 294 438 1298 1609 1564 1702 1685 947 765 200 109 122 872 997 931 RELEASE 14055 232 160 438 1298 1609 1564 1702 1685 1594 1370 200 109 122 719 697 557 STOR CHANGE 0 291 134 0 0 -647 -605 0 0 0 153 300 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 2902 2297 2297 2297 2297 2450 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1347.0 1337.5 1337.5 1337.5 1337.5 1340.2 1344.8 1350.0 DISCH KCFS 10.0 7.8 11.5 24.5 21.8 26.2 26.3 27.7 27.4 26.8 22.3 6.7 7.8 7.7 11.7 11.3 10.0 POWER AVE POWER MW 65 97 207 185 221 222 233 231 218 169 49 57 56 86 87 80 PEAK POW MW 351 356 356 356 356 356 356 356 328 284 285 285 285 297 319 339 ENERGY GWH 1390.3 23.3 16.4 44.8 132.8 164.2 159.7 173.6 171.9 157.2 125.4 17.8 9.6 10.8 64.4 64.5 53.8 --GAVINS POINT-- NAT INFLOW 1233 85 40 51 118 134 144 82 67 72 103 49 23 26 72 72 97 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 4 -7 -25 5 -8 0 -3 1 1 8 29 -2 0 -7 1 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 15128 322 192 464 1416 1716 1684 1740 1735 1661 1470 268 125 143 769 769 656 RELEASE 15128 322 192 464 1416 1716 1684 1740 1722 1636 1470 268 125 143 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 10.8 13.9 26.0 23.8 27.9 28.3 28.3 28.0 27.5 23.9 9.0 9.0 9.0 12.5 12.5 12.5 POWER AVE POWER MW 38 48 89 82 95 96 96 96 96 84 32 32 32 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 632.7 13.6 8.1 19.2 58.8 70.7 69.3 71.6 71.3 68.8 62.5 11.6 5.4 6.2 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 794 99 46 59 102 136 74 79 45 40 28 20 9 11 6 17 23 DEPLETION 276 7 3 4 23 36 32 39 38 25 11 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 15646 413 235 519 1495 1816 1726 1780 1729 1651 1487 281 131 150 761 771 702 KCFS 13.9 16.9 29.1 25.1 29.5 29.0 29.0 28.1 27.8 24.2 9.5 9.5 9.5 12.4 12.5 12.6 --TOTAL-- NAT INFLOW 17100 1051 490 630 1590 2457 4201 2103 845 594 852 384 179 205 313 407 799 DEPLETION 2795 24 11 14 188 608 1482 1181 338 -161 -109 -155 -72 -83 -191 -175 -105 CHAN STOR 13 94 -7 -25 -48 -53 8 7 1 40 45 29 -2 -5 -53 -20 2 EVAPORATION 1759 111 344 425 364 163 76 87 189 STORAGE 44268 44977 45214 45286 45145 45126 46127 45165 43600 42318 41473 41597 41639 41684 41185 40977 41181 SYSTEM POWER AVE POWER MW 554 655 861 910 1121 1085 1129 1125 866 683 414 441 444 672 724 705 PEAK POW MW 2168 2166 2167 2165 2164 2177 2161 2138 2131 2083 2086 2087 2088 2052 2068 2078 ENERGY GWH 7394.8 199.3 110.1 186.0 655.4 833.7 781.1 840.2 837.1 623.2 507.8 149.1 74.1 85.2 500.1 538.4 473.9 DAILY GWH 13.3 15.7 20.7 21.8 26.9 26.0 27.1 27.0 20.8 16.4 9.9 10.6 10.7 16.1 17.4 16.9 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:29 STUDY NO 21 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB15 2015 2016 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB --FORT PECK-- NAT INFLOW 5895 212 99 127 513 922 1305 666 295 267 349 172 80 92 251 229 317 DEPLETION 496 -30 -14 -18 65 293 501 268 33 -96 -82 -38 -18 -20 -117 -129 -103 EVAPORATION 433 27 83 104 90 41 19 22 47 MOD INFLOW 4966 241 112 145 448 629 804 371 179 259 341 169 79 90 321 358 420 RELEASE 5434 149 69 89 446 584 506 523 523 398 307 149 69 87 523 523 489 STOR CHANGE -468 92 43 55 2 45 298 -151 -344 -138 33 20 9 3 -202 -165 -69 STORAGE 10300 10393 10436 10491 10493 10537 10836 10684 10340 10202 10235 10255 10265 10268 10066 9901 9832 ELEV FTMSL 2209.7 2210.3 2210.5 2210.9 2210.9 2211.1 2212.9 2212.0 2209.9 2209.1 2209.3 2209.4 2209.5 2209.5 2208.2 2207.2 2206.8 DISCH KCFS 9.0 5.0 5.0 5.0 7.5 9.5 8.5 8.5 8.5 6.7 5.0 5.0 5.0 5.5 8.5 8.5 8.5 POWER AVE POWER MW 62 62 62 93 118 106 106 106 83 62 62 62 68 104 104 103 PEAK POW MW 139 140 140 140 140 142 141 139 138 138 138 139 139 137 136 135 ENERGY GWH 812.9 22.3 10.4 13.4 67.1 87.7 76.4 79.1 78.5 59.4 45.9 22.2 10.4 13.0 77.7 77.3 72.0 --GARRISON-- NAT INFLOW 8842 437 204 262 687 1261 2635 1290 430 191 466 177 82 94 161 161 305 DEPLETION 1052 3 1 2 -4 194 812 655 129 -133 -44 -138 -64 -74 -124 -92 -71 CHAN STOR 6 43 -27 -21 11 0 19 18 -5 -32 0 EVAPORATION 512 32 99 123 107 48 22 26 55 REG INFLOW 12718 626 272 349 1110 1630 2339 1126 725 618 729 415 194 224 720 776 865 RELEASE 13293 387 180 232 1071 1537 1309 1230 1230 996 830 402 187 214 1107 1230 1150 STOR CHANGE -575 239 91 117 39 92 1030 -104 -505 -378 -101 13 6 10 -387 -454 -285 STORAGE 12604 12843 12934 13052 13091 13183 14214 14110 13605 13227 13126 13139 13145 13155 12769 12315 12029 ELEV FTMSL 1817.3 1818.3 1818.6 1819.1 1819.3 1819.6 1823.7 1823.3 1821.3 1819.8 1819.4 1819.5 1819.5 1819.5 1817.9 1816.1 1814.9 DISCH KCFS 19.0 13.0 13.0 13.0 18.0 25.0 22.0 20.0 20.0 16.7 13.5 13.5 13.5 13.5 18.0 20.0 20.0 POWER AVE POWER MW 142 143 143 198 275 246 227 225 186 150 149 150 150 198 217 214 PEAK POW MW 398 399 401 401 403 418 416 409 403 402 402 402 402 396 390 385 ENERGY GWH 1777.4 51.2 24.0 31.0 142.8 204.5 177.1 168.7 167.3 134.2 111.3 53.8 25.1 28.7 147.1 161.3 149.2 --OAHE-- NAT INFLOW 1272 217 101 130 188 127 282 138 55 72 6 9 4 5 -111 -22 72 DEPLETION 736 25 12 15 51 76 157 191 128 31 -12 1 0 1 13 19 29 CHAN STOR -5 29 -24 -34 15 10 17 17 -23 -10 EVAPORATION 453 29 87 108 94 42 20 23 50 REG INFLOW 13371 608 270 347 1184 1554 1449 1158 1069 946 771 367 171 195 910 1179 1193 RELEASE 13961 441 276 384 1192 1533 1429 1704 1736 1030 852 236 126 141 948 1022 911 STOR CHANGE -589 167 -5 -37 -8 22 19 -546 -667 -84 -82 131 45 54 -37 157 283 STORAGE 13189 13356 13351 13314 13306 13327 13347 12800 12133 12049 11967 12099 12144 12198 12161 12317 12600 ELEV FTMSL 1586.6 1587.3 1587.3 1587.1 1587.1 1587.2 1587.3 1584.9 1582.0 1581.6 1581.2 1581.8 1582.0 1582.2 1582.1 1582.8 1584.0 DISCH KCFS 16.1 14.8 19.8 21.5 20.0 24.9 24.0 27.7 28.2 17.3 13.9 7.9 9.1 8.9 15.4 16.6 15.8 POWER AVE POWER MW 171 229 248 231 287 277 317 318 194 155 89 102 100 173 187 179 PEAK POW MW 605 605 604 604 604 605 592 577 575 573 576 577 578 577 581 588 ENERGY GWH 1920.5 61.7 38.5 53.6 166.4 213.6 199.4 235.8 236.4 139.5 115.3 31.9 17.1 19.2 128.7 138.9 124.6 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 13832 441 276 384 1192 1533 1429 1696 1712 999 825 223 120 135 933 1022 911 RELEASE 13832 441 276 384 1192 1533 1429 1696 1712 999 825 223 120 135 933 1022 911 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 16.1 14.8 19.8 21.5 20.0 24.9 24.0 27.6 27.8 16.8 13.4 7.5 8.6 8.5 15.2 16.6 15.8 POWER AVE POWER MW 70 93 101 94 117 112 129 130 82 68 38 44 43 76 82 76 PEAK POW MW 517 509 509 509 509 509 509 509 538 538 538 538 538 538 538 529 ENERGY GWH 800.3 25.3 15.6 21.8 67.5 86.8 81.0 96.1 96.9 58.9 50.4 13.7 7.4 8.3 56.9 60.8 52.9 --FORT RANDALL-- NAT INFLOW 430 83 39 50 105 74 141 31 18 -12 -37 -16 -7 -8 -49 -25 43 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 137 10 32 37 26 10 5 5 12 REG INFLOW 14045 523 314 433 1293 1598 1558 1699 1683 944 761 197 107 120 869 994 951 RELEASE 14045 232 180 433 1293 1598 1558 1699 1683 1591 1366 197 108 120 716 694 577 STOR CHANGE 0 291 134 0 0 0 -647 -605 0 0 0 153 300 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 2902 2297 2297 2296 2297 2450 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1347.0 1337.5 1337.5 1337.5 1337.5 1340.2 1344.8 1350.0 DISCH KCFS 10.0 7.8 12.9 24.3 21.7 26.0 26.2 27.6 27.4 26.7 22.2 6.6 7.7 7.6 11.6 11.3 10.0 POWER AVE POWER MW 65 109 205 184 219 221 233 231 218 168 49 57 56 86 86 80 PEAK POW MW 351 356 356 356 356 356 356 356 328 284 285 285 285 297 319 339 ENERGY GWH 1389.4 23.3 18.4 44.3 132.4 163.1 159.1 173.3 171.7 156.9 125.1 17.5 9.5 10.7 64.1 64.2 55.8 --GAVINS POINT-- NAT INFLOW 1284 88 41 53 123 139 150 85 69 75 107 51 24 27 75 75 102 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 4 -10 -22 5 -8 0 -3 1 1 8 29 -2 0 -8 1 2 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 15170 325 211 464 1416 1709 1684 1740 1735 1661 1470 268 125 143 769 769 681 RELEASE 15170 325 211 464 1416 1709 1684 1740 1722 1636 1470 268 125 143 769 769 719 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 10.9 15.2 26.0 23.8 27.8 28.3 28.3 28.0 27.5 23.9 9.0 9.0 9.0 12.5 12.5 12.5 POWER AVE POWER MW 38 53 89 82 95 96 96 96 96 84 32 32 32 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 634.4 13.8 8.9 19.2 58.7 70.4 69.3 71.6 71.3 68.8 62.5 11.6 5.4 6.2 33.0 33.0 30.7 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 977 121 57 73 125 167 91 98 56 49 35 25 11 13 7 21 28 DEPLETION 277 7 3 4 23 36 32 40 38 25 11 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 15870 439 264 533 1518 1840 1743 1798 1740 1660 1494 286 133 152 762 775 732 KCFS 14.8 19.0 29.9 25.5 29.9 29.3 29.2 28.3 27.9 24.3 9.6 9.6 9.6 12.4 12.6 12.7 --TOTAL-- NAT INFLOW 18700 1158 540 694 1741 2690 4604 2308 923 642 926 417 195 222 334 439 867 DEPLETION 2755 6 3 4 144 627 1538 1211 353 -171 -124 -163 -76 -87 -201 -183 -127 CHAN STOR -1 77 -10 -22 -46 -64 25 7 1 37 42 30 -2 -5 -63 -10 2 EVAPORATION 1708 107 334 413 353 158 74 85 184 STORAGE 41181 41970 42233 42369 42401 42560 43908 43107 41603 40380 39626 39791 39851 39918 39446 39283 39548 SYSTEM POWER AVE POWER MW 549 690 848 882 1110 1059 1108 1105 858 686 419 446 448 682 720 697 PEAK POW MW 2124 2123 2124 2125 2127 2144 2129 2105 2099 2052 2056 2058 2059 2024 2041 2052 ENERGY GWH 7334.9 197.7 115.9 183.2 634.9 826.1 762.2 824.6 822.2 617.7 510.5 150.8 74.9 86.1 507.5 535.5 485.1 DAILY GWH 13.2 16.6 20.4 21.2 26.6 25.4 26.6 26.5 20.6 16.5 10.1 10.7 10.8 16.4 17.3 16.7 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 29FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:29 STUDY NO 22 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB16 2016 2017 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 5983 214 100 129 521 936 1324 676 299 271 355 175 81 93 255 233 321 DEPLETION 511 -29 -13 -17 65 294 505 275 37 -96 -84 -40 -18 -21 -121 -131 -95 EVAPORATION 422 26 81 101 88 40 19 21 46 MOD INFLOW 5050 243 113 146 456 642 819 375 181 266 351 174 81 93 330 364 416 RELEASE 5379 149 69 89 446 492 536 553 553 399 307 149 69 79 492 523 472 STOR CHANGE -328 94 44 56 10 150 283 -178 -373 -133 44 25 12 13 -162 -159 -56 STORAGE 9832 9926 9970 10027 10036 10186 10470 10291 9919 9786 9830 9855 9867 9881 9719 9560 9504 ELEV FTMSL 2206.8 2207.4 2207.6 2208.0 2208.1 2209.0 2210.7 2209.6 2207.3 2206.5 2206.8 2206.9 2207.0 2207.1 2206.1 2205.0 2204.7 DISCH KCFS 8.5 5.0 5.0 5.0 7.5 8.0 9.0 9.0 9.0 6.7 5.0 5.0 5.0 5.0 8.0 8.5 8.5 POWER AVE POWER MW 61 61 61 92 98 111 111 110 82 61 61 61 61 97 103 102 PEAK POW MW 136 136 137 137 138 140 139 136 135 135 136 136 136 135 133 133 ENERGY GWH 795.1 22.0 10.3 13.2 66.1 73.0 80.0 82.8 82.1 58.8 45.3 22.0 10.3 11.7 72.3 76.4 68.8 --GARRISON-- NAT INFLOW 9140 452 211 271 710 1303 2723 1334 444 198 482 182 85 97 167 167 315 DEPLETION 1122 -1 -1 -1 12 210 837 687 134 -136 -49 -142 -66 -76 -126 -94 -66 CHAN STOR 0 38 -27 -5 -11 25 18 0 -32 -5 0 EVAPORATION 502 31 97 121 104 47 22 25 54 REG INFLOW 12895 640 281 361 1117 1579 2411 1169 766 637 752 426 199 227 698 778 853 RELEASE 13283 387 180 232 1101 1537 1309 1230 1230 996 830 402 187 214 1107 1230 1111 STOR CHANGE -388 253 100 129 16 42 1102 -60 -464 -359 -78 24 11 13 -408 -452 -258 STORAGE 12029 12282 12383 12511 12528 12570 13672 13611 13148 12789 12711 12735 12746 12759 12350 11899 11641 ELEV FTMSL 1814.9 1815.9 1816.3 1816.9 1816.9 1817.1 1821.6 1821.3 1819.5 1818.0 1817.7 1817.8 1817.9 1817.9 1816.2 1814.3 1813.2 DISCH KCFS 20.0 13.0 13.0 13.0 18.5 25.0 22.0 20.0 20.0 16.7 13.5 13.5 13.5 13.5 18.0 20.0 20.0 POWER AVE POWER MW 140 141 141 201 270 242 224 222 184 148 148 148 148 195 214 212 PEAK POW MW 389 391 393 393 394 410 409 402 397 396 396 396 396 390 383 379 ENERGY GWH 1751.7 50.4 23.6 30.5 144.4 201.1 174.3 166.3 165.1 132.5 110.0 53.2 24.8 28.4 145.4 159.3 142.3 --OAHE-- NAT INFLOW 1295 221 103 132 192 130 287 141 56 73 6 9 4 5 -113 -23 73 DEPLETION 752 25 12 15 52 77 160 195 132 32 -12 1 0 1 13 19 30 CHAN STOR 0 35 -27 -32 15 10 17 17 -23 -10 EVAPORATION 440 28 85 105 91 41 19 22 48 REG INFLOW 13386 617 272 349 1214 1558 1451 1158 1069 949 774 368 172 196 909 1177 1154 RELEASE 13783 379 244 342 1193 1528 1422 1702 1734 1030 852 236 126 141 949 1022 883 STOR CHANGE -396 238 28 7 21 30 29 -544 -666 -81 -79 132 46 55 -39 156 271 STORAGE 12600 12839 12867 12874 12895 12925 12953 12409 11743 11662 11583 11716 11762 11817 11777 11933 12204 ELEV FTMSL 1584.0 1585.1 1585.2 1585.2 1585.3 1585.5 1585.6 1583.2 1580.1 1579.8 1579.4 1580.0 1580.2 1580.5 1580.3 1581.0 1582.3 DISCH KCFS 15.8 12.7 17.5 19.2 20.0 24.9 23.9 27.7 28.2 17.3 13.9 7.9 9.1 8.9 15.4 16.6 15.9 POWER AVE POWER MW 145 200 219 229 283 273 313 314 192 153 88 101 99 171 185 178 PEAK POW MW 593 594 594 595 595 596 583 567 565 563 567 568 569 568 572 578 ENERGY GWH 1875.7 52.3 33.6 47.2 164.7 210.8 196.4 233.1 233.6 137.9 114.0 31.6 16.9 19.0 127.4 137.5 119.5 --BIG BEND-- EVAPORATION 129 8 24 31 27 12 6 7 14 REG INFLOW 13654 379 244 342 1193 1528 1422 1694 1710 999 825 223 120 135 934 1022 883 RELEASE 13654 379 244 342 1193 1528 1422 1694 1710 999 825 223 120 135 934 1022 883 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 15.8 12.7 17.5 19.2 20.0 24.9 23.9 27.6 27.8 16.8 13.4 7.5 8.6 8.5 15.2 16.6 15.9 POWER AVE POWER MW 60 82 90 94 116 112 129 130 82 68 38 44 43 77 82 76 PEAK POW MW 517 509 509 509 509 509 509 509 538 538 538 538 538 538 538 529 ENERGY GWH 790.1 21.7 13.8 19.4 67.6 86.6 80.6 96.0 96.8 58.9 50.4 13.7 7.4 8.3 57.0 60.8 51.2 --FORT RANDALL-- NAT INFLOW 447 87 40 52 108 77 147 32 19 -13 -38 -16 -7 -9 -51 -26 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 137 10 32 37 26 10 5 5 12 REG INFLOW 13884 464 283 393 1297 1596 1557 1698 1682 943 760 197 107 120 868 993 925 RELEASE 13884 173 149 393 1297 1596 1557 1698 1682 1590 1365 197 107 120 715 693 551 STOR CHANGE 0 291 134 0 0 -647 -605 0 0 0 153 300 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 2902 2297 2297 2296 2297 2450 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1347.0 1337.5 1337.5 1337.5 1337.5 1340.2 1344.8 1350.0 DISCH KCFS 10.0 5.8 10.8 22.0 21.8 26.0 26.2 27.6 27.4 26.7 22.2 6.6 7.7 7.6 11.6 11.3 9.9 POWER AVE POWER MW 48 91 186 184 219 221 233 231 218 168 49 57 56 86 86 79 PEAK POW MW 351 356 356 356 356 356 356 356 328 284 285 285 285 297 319 339 ENERGY GWH 1373.3 17.4 15.3 40.2 132.7 163.0 159.0 173.2 171.6 156.8 125.0 17.5 9.5 10.7 64.0 64.1 53.3 --GAVINS POINT-- NAT INFLOW 1297 89 42 53 124 140 151 86 70 76 108 52 24 27 76 76 103 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 8 -9 -22 0 -8 0 -3 1 1 8 29 -2 0 -8 1 3 EVAPORATION 45 3 8 11 10 4 2 2 5 REG INFLOW 15021 270 182 425 1416 1709 1684 1740 1735 1661 1470 268 125 143 769 769 656 RELEASE 15021 270 182 425 1416 1709 1684 1740 1722 1636 1470 268 125 143 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 9.1 13.1 23.8 23.8 27.8 28.3 28.3 28.0 27.5 23.9 9.0 9.0 9.0 12.5 12.5 12.5 POWER AVE POWER MW 32 46 82 82 95 96 96 96 96 84 32 32 32 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 628.3 11.5 7.7 17.6 58.7 70.4 69.3 71.6 71.3 68.8 62.5 11.6 5.4 6.2 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1038 129 60 77 134 178 96 104 59 52 37 26 12 14 7 22 30 DEPLETION 280 7 3 4 24 37 32 40 38 25 12 7 3 3 14 15 15 REGULATED FLOW AT SIOUX CITY KAF 15779 392 238 498 1526 1850 1748 1804 1743 1663 1495 287 134 153 762 776 709 KCFS 13.2 17.2 27.9 25.6 30.1 29.4 29.3 28.3 28.0 24.3 9.7 9.7 9.7 12.4 12.6 12.8 --TOTAL-- NAT INFLOW 19200 1192 556 715 1789 2764 4728 2373 947 657 950 427 199 227 341 449 887 DEPLETION 2859 3 2 2 162 646 1570 1254 366 -173 -130 -168 -78 -90 -207 -187 -113 CHAN STOR -1 81 -9 -22 -54 -46 4 7 1 43 43 30 -2 0 -63 -15 3 EVAPORATION 1674 105 328 404 346 155 73 83 180 STORAGE 39548 40425 40731 40924 40971 41193 42607 41823 40335 39140 38422 38603 38672 38753 38297 38142 38435 SYSTEM POWER AVE POWER MW 487 621 779 881 1082 1055 1106 1103 853 682 415 442 439 671 714 691 PEAK POW MW 2101 2101 2103 2104 2106 2125 2110 2086 2081 2034 2038 2040 2041 2006 2023 2035 ENERGY GWH 7214.2 175.2 104.4 168.2 634.2 804.9 759.6 823.1 820.6 613.8 507.3 149.5 74.3 84.2 499.1 531.1 464.7 DAILY GWH 11.7 14.9 18.7 21.1 26.0 25.3 26.6 26.5 20.5 16.4 10.0 10.6 10.5 16.1 17.1 16.6 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB

DATE OF STUDY 11/30/11 2011-2012 AOP LOWER DECILE RUNOFF 99001 9901 9901 PAGE 1 TIME OF STUDY 13:49:29 STUDY NO 23 VALUES IN 1000 AF EXCEPT AS INDICATED 28FEB17 2017 2018 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB --FORT PECK-- NAT INFLOW 6017 216 101 129 524 942 1331 680 301 273 356 176 82 94 256 234 323 DEPLETION 519 -30 -14 -18 65 295 509 283 42 -97 -86 -41 -19 -22 -122 -132 -96 EVAPORATION 384 26 79 99 86 25 12 13 45 MOD INFLOW 5114 245 114 147 459 647 822 371 180 271 356 191 89 102 333 366 419 RELEASE 5329 149 69 89 446 492 536 553 553 402 277 134 62 79 492 523 472 STOR CHANGE -216 97 45 58 13 155 286 -182 -374 -131 79 57 27 23 -159 -157 -53 STORAGE 9504 9601 9646 9704 9716 9871 10158 9976 9602 9471 9550 9608 9635 9657 9498 9341 9288 ELEV FTMSL 2204.7 2205.3 2205.6 2206.0 2206.0 2207.0 2208.8 2207.7 2205.3 2204.5 2205.0 2205.3 2205.5 2205.7 2204.6 2203.6 2203.3 DISCH KCFS 8.5 5.0 5.0 5.0 7.5 8.0 9.0 9.0 9.0 6.8 4.5 4.5 4.5 5.0 8.0 8.5 8.5 POWER AVE POWER MW 60 61 61 91 97 110 110 109 82 54 54 55 61 96 102 102 PEAK POW MW 134 134 135 135 136 138 136 134 133 133 134 134 134 133 132 131 ENERGY GWH 780.7 21.8 10.2 13.1 65.5 72.3 79.2 82.0 81.3 58.7 40.4 19.6 9.2 11.6 71.8 75.9 68.3 --GARRISON-- NAT INFLOW 9260 457 213 274 720 1320 2759 1351 451 200 488 185 86 98 169 169 319 DEPLETION 1134 -1 -1 -1 6 203 840 722 140 -139 -53 -146 -68 -78 -128 -95 -67 CHAN STOR 0 38 -27 -5 -11 24 24 -5 -33 -5 0 EVAPORATION 462 31 96 119 103 29 14 16 53 REG INFLOW 12993 646 283 364 1133 1603 2444 1152 768 646 739 435 203 234 703 781 858 RELEASE 13272 387 180 232 1101 1445 1309 1230 1230 1009 861 417 194 230 1107 1230 1111 STOR CHANGE -279 259 103 132 32 158 1135 -78 -462 -363 -122 18 9 4 -404 -449 -253 STORAGE 11641 11900 12003 12136 12168 12326 13461 13383 12921 12558 12436 12454 12463 12467 12064 11615 11362 ELEV FTMSL 1813.2 1814.3 1814.7 1815.3 1815.4 1816.1 1820.7 1820.4 1818.6 1817.1 1816.6 1816.6 1816.7 1816.7 1815.0 1813.1 1812.0 DISCH KCFS 20.0 13.0 13.0 13.0 18.5 23.5 22.0 20.0 20.0 17.0 14.0 14.0 14.0 14.5 18.0 20.0 20.0 POWER AVE POWER MW 138 139 140 198 252 241 222 221 185 152 152 152 157 194 212 210 PEAK POW MW 383 385 387 387 390 407 406 399 393 391 392 392 392 386 379 375 ENERGY GWH 1736.4 49.8 23.4 30.2 142.8 187.5 173.2 165.3 164.1 133.4 113.2 54.7 25.5 30.2 144.1 157.9 141.0 --OAHE-- NAT INFLOW 1305 222 104 133 193 130 289 142 57 74 6 9 4 5 -113 -23 74 DEPLETION 765 25 12 15 52 78 163 200 135 32 -13 1 0 1 14 20 30 CHAN STOR 1 36 -28 -25 8 10 16 16 -3 -18 -10 EVAPORATION 398 27 83 101 88 25 12 14 47 REG INFLOW 13415 619 272 350 1214 1472 1443 1155 1069 966 807 399 186 218 914 1176 1155 RELEASE 13702 437 252 340 1190 1406 1423 1700 1733 1030 853 226 121 136 950 1022 883 STOR CHANGE -288 182 20 11 24 66 19 -545 -664 -65 -46 173 65 82 -35 154 272 STORAGE 12204 12386 12406 12416 12441 12507 12526 11981 11316 11252 11205 11379 11443 11525 11490 11644 11916 ELEV FTMSL 1582.3 1583.1 1583.2 1583.2 1583.3 1583.6 1583.7 1581.2 1578.1 1577.8 1577.6 1578.4 1578.7 1579.1 1578.9 1579.7 1580.9 DISCH KCFS 15.9 14.7 18.2 19.0 20.0 22.9 23.9 27.6 28.2 17.3 13.9 7.6 8.7 8.6 15.4 16.6 15.9 POWER AVE POWER MW 166 205 215 225 258 270 309 310 189 152 83 96 94 170 183 176 PEAK POW MW 583 583 583 584 586 586 573 556 555 554 558 560 562 561 565 572 ENERGY GWH 1844.5 59.6 34.4 46.3 162.4 191.9 194.4 230.2 230.7 136.3 112.8 30.0 16.1 18.1 126.5 136.3 118.5 --BIG BEND-- EVAPORATION 120 8 24 31 27 8 4 4 14 REG INFLOW 13582 437 252 340 1190 1406 1423 1692 1709 999 826 218 117 132 936 1022 883 RELEASE 13582 437 252 340 1190 1406 1423 1692 1709 999 826 218 117 132 936 1022 883 STORAGE 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 1621 ELEV FTMSL 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 1420.0 DISCH KCFS 15.9 14.7 18.2 19.0 20.0 22.9 23.9 27.5 27.8 16.8 13.4 7.3 8.5 8.3 15.2 16.6 15.9 POWER AVE POWER MW 70 85 89 94 107 112 129 130 82 68 37 43 42 77 82 76 PEAK POW MW 517 509 509 509 509 509 509 509 538 538 538 538 538 538 538 529 ENERGY GWH 786.1 25.1 14.3 19.2 67.4 79.6 80.6 95.8 96.8 58.9 50.5 13.4 7.2 8.1 57.0 60.8 51.2 --FORT RANDALL-- NAT INFLOW 453 88 41 53 110 78 149 33 19 -13 -39 -16 -7 -9 -52 -26 45 DEPLETION 80 1 1 1 4 9 12 18 15 7 1 1 0 1 3 3 3 EVAPORATION 129 10 32 37 26 6 3 3 12 REG INFLOW 13826 524 293 391 1296 1475 1560 1697 1681 943 760 195 106 119 868 993 925 RELEASE 13826 232 159 391 1296 1475 1560 1697 1681 1590 1365 195 107 119 715 693 551 STOR CHANGE 0 291 134 0 0 0 0 -647 -605 0 0 0 153 300 374 STORAGE 3124 3415 3549 3549 3549 3549 3549 3549 3549 2902 2297 2297 2297 2297 2450 2750 3124 ELEV FTMSL 1350.0 1353.6 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1355.2 1347.0 1337.5 1337.5 1337.5 1337.5 1340.2 1344.8 1350.0 DISCH KCFS 9.9 7.8 11.4 21.9 21.8 24.0 26.2 27.6 27.3 26.7 22.2 6.6 7.7 7.5 11.6 11.3 9.9 POWER AVE POWER MW 65 97 185 184 203 221 233 231 218 168 48 56 55 86 86 79 PEAK POW MW 351 356 356 356 356 356 356 356 328 284 285 285 285 297 319 339 ENERGY GWH 1367.5 23.3 16.2 40.0 132.6 150.7 159.3 173.1 171.5 156.8 125.0 17.3 9.5 10.6 64.0 64.1 53.3 --GAVINS POINT-- NAT INFLOW 1303 90 42 54 125 141 152 87 71 76 108 52 24 27 76 76 103 DEPLETION 114 0 0 0 5 19 24 39 10 -5 2 5 2 3 10 1 CHAN STOR -1 4 -7 -20 0 -4 -4 -3 0 1 8 29 -2 0 -8 1 3 EVAPORATION 41 3 8 11 10 3 1 1 5 REG INFLOW 14972 326 194 425 1416 1593 1684 1740 1735 1661 1470 268 125 143 769 769 656 RELEASE 14972 326 194 425 1416 1593 1684 1740 1722 1636 1470 268 125 143 769 769 694 STOR CHANGE 13 25 -38 STORAGE 342 342 342 342 342 342 342 342 355 380 380 380 380 380 380 380 342 ELEV FTMSL 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.0 1206.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1207.5 1206.0 DISCH KCFS 12.5 11.0 13.9 23.8 23.8 25.9 28.3 28.3 28.0 27.5 23.9 9.0 9.0 9.0 12.5 12.5 12.5 POWER AVE POWER MW 38 49 82 82 88 96 96 96 96 84 32 32 32 44 44 44 PEAK POW MW 114 114 114 114 114 114 114 115 117 117 117 117 117 78 78 76 ENERGY GWH 626.5 13.8 8.2 17.6 58.7 65.8 69.3 71.6 71.3 68.8 62.5 11.6 5.4 6.2 33.0 33.0 29.6 --GAVINS POINT - SIOUX CITY-- NAT INFLOW 1062 132 62 79 136 182 99 106 61 53 38 27 12 14 8 23 30 DEPLETION 283 7 3 4 24 37 32 40 39 26 12 7 3 3 14 15 16 REGULATED FLOW AT SIOUX CITY KAF 15751 451 252 500 1528 1738 1751 1806 1744 1663 1496 288 134 154 763 777 708 KCFS 15.2 18.1 28.0 25.7 28.3 29.4 29.4 28.4 28.0 24.3 9.7 9.7 9.7 12.4 12.6 12.8 --TOTAL-- NAT INFLOW 19400 1205 562 722 1808 2793 4779 2399 960 663 957 431 201 230 344 453 894 DEPLETION 2895 2 1 1 156 641 1580 1302 381 -176 -137 -173 -81 -92 -209 -188 -114 CHAN STOR -1 78 -7 -20 -55 -35 -8 7 0 41 47 30 -2 -8 -58 -15 3 EVAPORATION 1535 104 322 397 340 96 45 52 178 STORAGE 38435 39265 39566 39767 39837 40216 41657 40851 39364 38184 37489 37738 37839 37947 37502 37351 37653 SYSTEM POWER AVE POWER MW 537 635 771 874 1005 1050 1100 1096 851 678 407 434 442 667 710 687 PEAK POW MW 2082 2082 2084 2086 2091 2110 2095 2069 2064 2018 2024 2026 2028 1993 2010 2022 ENERGY GWH 7141.7 193.4 106.7 166.5 629.4 747.8 756.0 818.1 815.6 612.9 504.4 146.5 72.9 84.8 496.5 528.0 462.0 DAILY GWH 12.9 15.2 18.5 21.0 24.1 25.2 26.4 26.3 20.4 16.3 9.8 10.4 10.6 16.0 17.0 16.5 INI-SUM 15MAR 22MAR 31MAR 30APR 31MAY 30JUN 31JUL 31AUG 30SEP 31OCT 15NOV 22NOV 30NOV 31DEC 31JAN 28FEB